I just received my 7d and have the itch for a new lens. I'm looking at buying my first prime. I was very set at first on the 50mm 1.4, but then started reading and results are a mixed bag for reliability for the price. I know this is also an issue with the Nifty Fifty, but at least its very affordable so it isn't as big a deal to me if it breaks at some point. I would be upset however spending 300+ on the 1.4 and it doesn't last.
Finally, I've started to see a lot of great reviews for the Sigma 30mm. However, again..it seems like all these lens's have an issue and it seems common place for folks to go through multiple copies of this lens before obtaining a sharp copy that is able to focus accurately. Overall, I'm looking for the best lens to produce great shots that will last. I'm nowhere near pro level, but would like a lens that is able to focus indoors. I have a Tamron 17-50 so I"m very used to slow AF and hunting in low light conditions.
Thanks for any advice!