Today I received a Canon 28mm f1.8 USM from Canon (refurbished). I was extremely impressed at how amazingly sharp this lens is from 2.8 up!!
This is my first USM lens. I currently own a 16-35mm f4.0L, 70-200mm f2.8L, a 50mm f1.8 EF, an EFS 10-18, EFS 55-250 and a couple of kit lenses (18-55 and the 55-300).
My primary camera is a 7dmk2, travel camera is a T6. I plan on getting a full frame in the next year.
For personal preference reasons I want to shoot with a few primes instead of with a zoom lens. I know I can just get a 16-35mm 2.8L to replace my 16-35mm 4.0L, but I prefer lighter, faster primes. I don't want to spend a small fortune on any more L glass either (I shoot with both Canon and Nikon and I have a bunch of money invested in my current Nikon D750 plus a ton of Nikon lenses - no, I don't want to sell anything, I actually enjoy using both systems equally).
What I'm looking for are suggestions, actual user experiences with Canon USM primes. Which USM primes have you used? Which are your favorites? Which ones turned out to be disappointments?
p.s. While I am now only using a crop sensor Canon, I would like to purchase and keep whatever USM primes I buy to use in the near future with a Canon full frame camera I will be buying, so I'm looking to buy nice (not premium quality expensive) glass first.


