Just bought this camera for my wife today
i also attached my 70-200 for giggles and it actually did not feel too bad.
Those test shots I posted was taken with my 70-200 2.8 IS, and it didn't feel bad at all.
I think any lens where you would support the setup with the lens anyway, will not feel much worse.
the lenses in the middle however require a little different handling. Not bad, just some times on my full frame where I would not feel like I need to support the lens, I do with the SL1.