I don't care what anyone says, the 50mm 1.8 MKI is something special. I've shot so many awesome pics with this lens. No, the AF isn't the fastest in the league, but so what. It's sharp, very sharp wide open. I've had the 85 1.8 (too much purple for me) and Sigma 50 1.4 (sold my first 50 MKI for it, then sold the Siggy and got another 50 MKI as part of the deal). I sold both of 'em but I still have my Nifty OLD fifty. The Siggy was nice, but overhyped TO ME. My current prime lineup is: 50 1.8 MKI, 100 2.8 USM (non L), 200 2.8 L, So yes, I do have experience with some good glass. I am here to represent the 50mm 1.8 MKI as one of the best fast primes out there. I'm not an L snob, good glass is good GLASS, so attack me if you want. The barrel or weathersealing or USM or IS or anything doesn't show up in a print; maybe the advantages of having them helps for certain shots. Good glass is good glass. Thank you for my 5 minutes of fame. Here comes trouble...