Hey guys, I've been using the Canon 50 STM since it came out, and I think it's decent enough to replace the 50 1.8 II for sure.
It has great build quality and AF. That said I think I still prefer the Canon 40 2.8 for travel and landscape stuff.
Review: http://breakthrough.photography …-1-8-stm-review-hands-on/
Image Gallery: http://breakthrough.photography …mm-1-8-stm-image-gallery/
I was also curious to see what the performance of the new Canon 50mm 1.8 STM was like compared to my FD and FL 50 1.8 lenses, so I put that in there too. Having shot this with my modified-IR 5D, it's also a very good IR performer with virtually zero cone overexposure for infrared.