I owned the 24-105mm f4L IS for a few months, and while it was a very good lens, the distortion at the wide end should not be this bad for an L lens, in my opinion, and it's not exactly the sharpest lens in town. I think it makes sense if Canon can make the 24-70mm f4L IS lighter but with the same optical quality as the more expensive 24-70mm f2.8L II, and sell it at the same price as the 24-105mm f4L. It would be a great lens for full frame. The 24-70mm f2.8L IS is a stellar lens, optically.
More interesting is the 35mm f2 IS. I also owned the non-IS version for a little while and liked it a lot. I even did a comparison of it against the 35mm f1.4L, here. Again, the price of the new lens is a bit ridiculous at about $900, more than twice that of the lens it replaces. Hopefully, over time, the prices will come down and settle down to around $500 to $600.
Downtown Tower - NEX-5N & Rodenstock Rodagon-WA 60mm f4.