I have never used any Bronica equipment, so I cannot give a comparison. I can talk about the Hasselblad wide-angle lenses and also the Pentax 6x7 wide lenses. While I have not used it, the Hasselblad 38 f4.5 is regarded by many as the gold standard for wide-angle. Pentax 6x7 wide-angle lenses can hold their own. Admittedly, the 6x7 negative/transparency is joy to look at, enlarge, or scan. I've sold many images shot for assignment or my stock photo files on all four formats: 35 mm, 6x4.5, 6x6, and 6x7. This question of which lens is sharpest is one I have never participated in. Today with digital photography and Photoshop or one of the other programs, you can make any lens look great.