Many years ago I owned an RB67 Pro-S with 37 fish, 50, 65, 90, 127, 140 macro, 180 and 250... nearly a full kit. These were all the single coated versions and most were superb performers. My 250 wasn't quite as sharp or high-contrast as I'd hoped but wasn't really bad. Maybe the 250 was a lemon. I've never used any other RB lenses. I often miss that big ol' machine. I never used that particular camera for landscapes but had I done so I would have carried the 50, 65, 90, 127 and 180... quite a heavy kit to haul. As I understand it, Mamiya RB/RZ lenses only got better over the years.