Most boat comparisons are messy. Different hulls, different volumes, different builders, different philosophies, and you end up weighing four things at once and deciding on the interior.
The Galeon 650 SKY and the Galeon 640 FLY are not that. They are the same hull, developed alongside each other, and Galeon calls them twin models. Same 68' 3" length overall. Same 16' 5" beam. Same 24' 3" beam with the balconies open. Same 991 gallons of fuel. Same three-or-four cabins plus crew. Same up-to-30-knot maximum.
Which makes the decision between them unusually clean, and unusually interesting. It is one question, and the answer has a number attached to it.
The question: do you want a top deck that closes?
The 650 SKY's upper deck sits under a carbon hardtop that can be opened in moments or shut off completely. Up there is a central helm station and an L-shaped settee with a table for passengers. There is also a glass sunroof over the saloon below.
The 640 FLY is the conventional answer: an open flybridge, on the same hull.
Here is why the closing top matters more than it sounds like it should. A conventional flybridge is wonderful for perhaps four months a year in most of the places people keep a 68-footer. The rest of the time it is a large empty space you are carrying around. A deck you can close is a deck that stays in play when it is raining sideways in April or when it is 95 degrees and there is no shade in August.
If your season is genuinely short, this is not a styling decision. It is more usable boat.
The number: about 5,400 lbs
Mass in light craft condition with base engines is 83,687 lbs on the 650 SKY. On the 640 FLY it is 78,264 lbs.
That difference - roughly 5,400 lbs of carbon hardtop, enclosing structure and glass - comes out of the same hull's carrying capacity. Maximum load on the 650 SKY is 13,669 lbs.
Do the arithmetic yourself. Full tanks, a tender, four adults, and everything a family brings aboard for two weeks adds up faster than people expect on any boat. If you cruise loaded and you count pounds, this is the honest price of being able to shut the top deck.
If you do not cruise loaded, it is a number you will never notice.
Beach Mode, and nearly twenty feet of balcony
The balconies on this boat are worth describing properly.
They run 19' 8" fore and aft, have partly glazed floors, and carry a breakfast bar on each side. Opened, the usable beam goes from 16' 5" to 24' 3". With the side windows retracted, the galley serves refreshments to both bars from inside, so nobody is walking a tray around the boat.
Partly glazed floors is the detail people react to in person. Standing over water on a glass panel is a different sensation from standing on a solid platform, and it is the kind of thing that is either the reason you buy the boat or completely irrelevant to you. Go and stand on one.
The cockpit behind them has a U-shaped settee that can be shaded for privacy, or for watching a television that rises out of the galley top. Aft of that, a hydraulic bathing platform gives access to the skipper cabin - so crew come and go from the water rather than through the accommodation.
The bow you can walk into
On most boats this size the foredeck is the space nobody uses under way, because getting there means going out and around the side decks.
The 650's answer is a retracting middle section of the windshield, which opens a front entrance from the main deck straight onto the bow. Out there is a transformable sundeck and seating area, with a wine cooler nearby and carbon supports that run a bimini up quickly.
That single change turns the foredeck into a second cockpit rather than a sunpad you visit at anchor. It is one of the more genuinely useful ideas on the boat and it is easy to miss when you are reading numbers.
Three lower decks, chosen once
Below deck there are three layouts, and they are different boats rather than trim levels.
The standard arrangement is three cabins, each with a private bathroom. The second option replaces that with a super master cabin amidships. The third is a four-cabin arrangement for larger families or for hosting. Three heads throughout.
The skipper cabin aft is entered from the hydraulic bathing platform rather than through the accommodation, which is the arrangement most owners prefer once they have lived with the alternative.
Pick carefully, because this is not a later refit.
The rest of the numbers
Length overall is 68' 3" on a 60' 5" hull, with 16' 5" of beam and 3' 4" of draft measured without propellers. That draft figure is worth noticing on a boat this size - it is shallow enough to change where you can anchor in the Bahamas or the Keys.
Fuel is 991 gallons in two equal tanks and fresh water is 211 gallons. Bridge clearance is 24' 0" from the waterline at minimum draft, and transport height is 27' 2". The hull is CE Category B and rated for fifteen aboard.
Power runs from 2 x 900 hp to 2 x 1,200 hp - a 600 hp spread across the pair. Galeon quotes up to 30 knots. Ask for observed burn at your normal cruising rpm in writing at sea trial and work your own range off 991 gallons.
And drive the specification you intend to order. With 600 hp of spread available, a demo at the top of the range tells you very little about a boat at the bottom of it.
Where it sits outside Galeon
Against the wider 65-to-70-foot market, the 650's strongest cards are the two features above: balconies 19' 8" long with glazed floors and a bar on each side, and a bow you walk into through the windshield. Neither is common in this class.
Where the established names push back is on published performance data and on the age of their service networks, and both are fair points to weigh. The Azimut Fly 68 at 68' 10" and Princess S65 at 67' 7" sit either side of the same argument - one conventional flybridge, one sport profile - if you want to see how other builders answer it.
But the comparison that will actually decide this purchase is the one down the hall. Go and stand on a 650 SKY and a 640 FLY in the same week, in the weather you actually cruise in, and the 5,400 lbs will either matter to you or it will not.