I have both. My 60 is fairly old (2006), and photozone reports suggest newer ones give slightly sharper borders. For some reason my 60 gives slightly blurry borders at infinity with a polarising filter even at f7.1, but the 50 f1.8 is fine from f4 with the same filter. I pefer the 50 for landscapes for that reason and because it has zero lateral CA. The 60 has a bit of that. I take a lot of flat-field macro shots with the 60, and find that its focus field is slightly distorted even at f8. It probably isn't a brilliant copy.