Aware of the Bronica 645 RF, seems nice, nothing faster than f/4. I wouldn't mind a nice f/2.8 folder that can be focused accurately. Otherwise, looking at the Mamiya M645, the 150mm f/2.8 would add 2-3.5 stops more light for portraits (RB67 180mm Sekor C is my main), not looking to replace my RB67 setup that will remain as my main plan-to-shoot camera, just to have more lightweight + lower light MF to carry around. I really like that FOV. Plus also the 80mm f/1.9 is enticing. Are there any other options I should be looking at? Or is the M645 series basically it? Also pc-sync (or at least hotshoe) would be nice. M645 with standard lens is half the weight of RB67 setup with standard lens, so that is enticing somewhat.