Getting Nex 7, should I keep my Canon L lenses?

Hi all..

I'm selling my 60D and getting the Nex 7 (on order already at B&H). Question is, do I sell all of my lenses or keep them to use with the Nex? I have a 35 1.4 L and also a 70-300 L with IS.

Will these lenses be good to use with the Nex or will the new upcoming Sony lenses be better?

Thanks!