I am a person who wont upgrade. I think of what I shoot, more importantly what size I print. Then I got a great offer to buy the last model. I sold it, and put the money down on the new one. So in the real world of a none pixel peeper what's it really like?
Absolutly amazing! I'm not a pro, i don't work for Canon and i'm very very tight with what i buy camera wise, but whatever they are feeding the people in the lens dept of Canon, can i have some. Yes its heavy, but its built like a tank, will work longer than you live, will take shots when the none L guys retire to bed when its raining. It handles great, nice balance on a pro body. The shots against the old model are as sharp when stopped down but wide open there's only one winner. But better still the colours and contrast are amazing.But above all the IS. I just cant believe i can get pin sharp images at 1/15th but you can.
So is it worth the money and upgrade? Yes. People go on about a prime is sharper. A bit yes but think of all the shots they miss changing lens's, or needing to carry several bodies and the size you print, the lack of four stop IS etc. I have an 85mm prime and for that nice controlled shot its a winner but for %95 of the time, this lens will do shots the 85 cant do. Or the 135, or the 200....
Oh, nearly forgot, the autofocus is laser fast to.