'Not Happy Narrelle!'
I guess it depends on what you are comparing it too. I bought a low mileage 5d last year and 3 primes. To replace my Mamiya M6. The 20mm I am comparing to my 65mm Schnieder K mounted on a 612 camera. The Canon 20mm doesn't compete well. Faster, yes, but sharpness and distortion is pretty awful. Maybe i am making an unfair comparison, maybe i got a bad example. Perhaps I have been spoilt, but if it costs this much to get into 'good' digital it's a bit disapointing.