The typical 6 cm x 6 cm image from Hasselblad - Polaroid backs used/uses (if lucky enough to have original Polaroid instant film in hand, as I have, a limited supply of), 4.25" x 3.25" pull apart sheet films.
This meant that a large section of the 100 camera series, film image area was 'wasted' in each shot, but this was accepted as a part of the process and was valuable in detailing enough of the photograph's set-up for approval or troubleshooting.
Besides the b&w positive photographs Polaroid also offered the same positive film with printable darkroom negative as in type 55 4" x 5" film.
Today, Instax wide films are being used to make adapters for several medium format cameras and if no already done, should be available soon.
There is also the "Polaroids Original" sx-70 and 600 films to work with and photographers themselves are making backs/adapters for their cameras to use these offerings.
Sharpness in instant films is a movable feast, and acceptable results depends on the photographer/art director and their abilities in using their kit in concert as a whole.
One last, (from me) option is a portable box film processor, for use with positive enlarging papers, on site, for single sheet Hasselblad backs.
A box of order pre-cut paper positive papers, a dark bag/tent for film loading/unloading in and out of the back, and a sturdy dark box with blackout sleeves, with developer, stop, fix and rinse water, (Ziplock box type jars will serve well in this instance) completes the kit, which would be as useful in the studio, near the set, and be more usable than a nearby darkroom, as the art director, models, clients, etc will be impressed with the small magic show that would ensure during a shoot.
Think and become acquainted with the many possibilities out there for enhancing your ability to bring home, the "money shot" when it really counts.
By-the-way, even if you do no develop on site, during the shoot, a single sheet back and dark bag/shot print box is still valuable in it gives you the opportunity to check each shot print/paper negative before loading your films into developing tanks, so you can be aware of important negitives needing some adjustment in processing for best results.
IMO.