I would personally like to see faster MF lenses - f2 would be great (for available light shooting as much as short DOF) and fortunately there are a few available. f2.8 is quite decent too. There are probably more fast lenses than you think. Here is a list I made which is probably missing one or two.
Rollei PQ/S: 50mm f2.8, 80mm f2, 80mm f2.8, 110 f2, 180mm f2.8
Contax 645: 80mm f2, 45mm f2.8, 140mm f2.8
Bronica ETR (645) has a 50mm f2.8, 60mm f2.8, 75mm f2.8.
Bronica SQ series (6x6): 80mm f2.8
Hasselblad V: f/2.8 80 mm 'C' lens. The rest of the C series is slower. The F lenses were faster: f/2 110 mm, f/2.8 50 mm, f/2.8 80 mm and f/2.8 150 mm
Hasselblad H: HC f/2.8 80 mm and HC f/2.2 100 mm
Mamiya 645: 80mm f1.9, 80mm f2.8, 45mm f/2.8, 55mm f/2.8, 150mm f2.8, 200mm f2.8, 300mm f2.8
Mamiya 67: 110mm f2.8
Pentax 67: 75 mm f2.8, 90mm f2.8, 105 mm f2.4, 165mm f2.8
Pentax 645: 45mm f2.8, 75mm f2.8, 150mm f2.8