>>2844614imho superwides lose their appeal quickly, an 8mm fish will be good for a couple of shots and that's it. If you're on crop, get a Sigma 18-35 1.8, it'll be amazing for this kind of stuff.
Took this yesterday with its "big brother", the 24-35 f/2. I love how it can go wider than the 18-35, but I think 24mm effective is the "sweet spot", after that you're looking at specialty focal lenghts suited for only a few angles.