Heehee. I just got a 28/ 1.8, now. ...from somewhere.
Only had it for a week or so, but I'm quite pleased with the optical performance: the 30 has kind of mixed reviews, and a rep for being a lot sharper in the center than edges: this wouldn't help me a whole lot, cause I like to put my subjects off-center when I use a lens this wide, (Yeah, 28mm equivalent is 'this wide' to me.
)
It's really quite big, (that's the only drawback, to my purposes: it's just kind of imposing to subjects. But, then again, it's a full-frame 1.8 wide angle for film, too, heheheheh.
) I get good sharpness, and it certainly does AF well. I don't know that I've tried it wide-open at infinity, yet, though: so far it's meeting with my unqualified approval.