OP, I have used numerous Ms, with VFs of .91x, .85x, .72x and even .58x. I am terribly short-sighted and have had to wear corrective lenses since I was 8. Wearing glasses with a RF is cumbersome and compromising. No matter which body you select, your ability to compose is not as effective when compared to shooting without glasses. This applies when using a .58x VF up to a .91x VF; it is a matter of 'to what extent is the compromise' of a given VF magnification when focusing or composing. For this reason my RF practice has made me become a contact lens wearer when I shoot. Using the highest magnification VF possible affords you the most accurate focusing and the most distinct composing (because of the higher magnification). Therefore I recommend you use a 50mm with a M3 if you wear contacts: this is the very best VF with a 50mm lens, there is no compromise. Otherwise I'd recommend the M2 with a 50mm lens if you will not wear contacts; this is not the best VF for a 50mm, there is a compromise, but it does work best for a glass wearer.