Sigma 20 mm. f1.8 EX DG AF

[Joseph Tainter]

Does anyone have this? If so, what are your impressions?

I need wide primes that are fast because I use them indoors. I am afraid 
that the DA 14 f2.8 won't cut it. The widest prime I've got is the FA 24 
f2.0, but its aov on the *ist D isn't wide enough.

I thought about the Mir 20 mm. f2.5, but it is so thick at the rear that 
it may not fit under the *ist D's prism.

Thanks,

Joe