I'll swear by my Samyang 35/1.4, sharp corner-to-corner, 'normal' framing on 7D for half-full body portraits and groups if you've got room, and I stitch a lot of panoramae taken with it too. A tiny hair below the zeiss for IQ, built sturdily enough but not zeiss or canonL quality.
Manual-focus isn't for everyone, but TS-E and Zeiss are also MF.
There's not much else in the faster-wider-affordable wide of the market, from every review i've seen stay away from the sigma 20/1.8, the 28/1.8 and the 20/2.8 are kinda old designs and don't really cut it on digital sensors either.
14/2.8L II and 16-35 f/2.8L are too expensive i presume?