No, its not, in fact it is the very opposite. the non VC is sharper, and thats what everyone gets. Thats what I have and love. its highly recommended by everyone if you search bar.
even for the t2i? how about when im using a my mic? even if it's stereo and not shotgun? what if im using a filter, in that case wouldnt the VC be better?
it's honestly all preference. Look around at videos with both and see what you like most. The VC version tends to get a choppy feel, which I think is pretty cool at times. i have the non-vc and love it but it's all about what style you're going for
no a filter would not fuck everything up, if you are retarded and buy cheap ones then yes it will degrade IQ, but if you buy quality filters then it won't effect anything