wide andgle lens for a 60d

So, I am relatively new to photography, but not quite a beginner. I have a canon 60d with a 18-135 and a 70-300 lens, I am wanting to buy a wide angle and money isn't an issue, I've been, thinking about the 16-35 since they are supposed to work well with full fram censors and I'm planning on upgrading to a 5D mark III in about a 2 years, but would I be better off with a differeant lens for my 60d. Thanks.
 
Stick with crop format wide/ultrawide lenses for a crop body - those focal lengths are where the lens design benefits of a smaller sensor are significant. Don't buy a FF lens 'because you may go FF, in a few years' - buy a good crop format lens and sell it later.

Get the Canon 10-22mm, Tokina 11-16mm, or Sigma 8-16mm. The Tokina has the narrowest range but a constant and fast f/2.8 aperture. The Sigma is the widest, with the slowest aperture. The Canon is intermediate on both. All three are very good optically. The Canon will likely hold resale value better, if that matters.

If you don't need the ultrawide range (<15mm on APS-C), ditch your 18-135 and get the 15-85, which is optically much better than the 18-135.
 
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