The reason to look hard at this boat is that you specify the interior rather than accept it. Sunseeker offers configurable layouts on the Manhattan 68, and the fork is at the staircase.
Take the dual-staircase route and you get a four-cabin boat with a private staircase leading down to a midships full-beam owner's cabin. That is the arrangement to choose if owner privacy is the priority, because the owner's party never crosses the guest route.
Take the single-staircase route instead and the volume that the second stair would have used becomes an opposing seating group in the main saloon. From there you can run three cabins with a grander entrance to the owner's cabin and an office in the plan, or you can add a Pullman-style fourth cabin and keep the guest count. Either way the main deck is the beneficiary.
Published accommodation is four cabins for up to eight guests plus two crew, with three en-suites and a day head. That crew provision is the first in the Manhattan family, and it is what makes this the size where an owner can start using paid help rather than doing everything himself.
Above, the flybridge has been redesigned with a larger and more versatile seating arrangement and a new ergonomic console. If you have looked at an earlier Manhattan 68, this is the space where the difference is most obvious.
Aft, the cockpit was reworked for seclusion rather than volume, and the built-in privacy screen is the piece to try in person. On a boat that will sit stern-to in a busy marina, a screen between your evening and the passing crowd is worth more than another cubic foot of locker.
Fresh water is 238 US gallons against a 53 US gallon black tank. With eight guests and two crew aboard, water is the constraint on how long you stay out, not fuel.