When I think wide angle, I don't think 35mm or 28mm.  Heck I don't even think 20mm anymore, for me wide angle is something more.  I find that my 16-35/2.8 L spends a lot of time on the 1Dx.  My favourite wide angle for the last couple of years has been the 14/2.8 L from Canon.  It's ridiculously sharp, has near infinite depth of field and has very low distortion.  Who could want more?  Well as of right now, I do.