Shitty on a 40D, I need to buy another body but I'm a...
Originally Posted by The1
I can manual focus better than the 40D for absolute sharpness. On a 50/60/7/5D it should be better. Well worth the price of admission but it depends on what you shoot. I went with prime vs. 70-200 only because I would use it for birds and jets ( hit Maverics once). I have only regretted not going 70-200 a few times.Pop a 1.4x on and it is still good.
I don't know what wastegate rattle sounds like but the 300 F4 IS sounds like it would be comparable. From what I understand, that is normal.