I'll admit I'm "biased" toward Canon lenses. I've found them to be consistently good and I haven't wanted to gamble with the other makes. So, for ultra wide on a crop body I went for the EF-S 10-22 and was quite happy using it with my 30D. When I went with the 5D Classic I picked it up with the 24-105 "kit lens", what a great kit!
For the ultra-wide I went for the 16-35, I was quite happy with the lens! Sadly, I recently had to sell it but not for any fault on its own!












