I doubt I'll see another Lumia 920 in public until after the holidays. I know the world is full of Android and iPhone users, and a few Blackberry fans, so the chances of meeting someone with class and sophistication such as my own are slim.
Only by a sales person (or manager) in the store. I'd be happy if I could see one in my pocket. They have no stock at any stores near me in Los Angeles. It's a shame to have such low inventory at launch. They should pull all ads until they get stocked up.
I'm also at a huge university and chances of seeing one are still slim I bet. I don't leave my majors building too often. Even then... on Friday I had a few people there at the store for the Note 2 and one didn't even know the Lumia was a Windows Phone.
I was in NYC this weekend and didn't see a single one, and I was at a bunch of touristy spots (AMNH, Times Square). I sure was happy to wield my cyan 920 though, hoping to catch some eyes as I was taking a ton of photos. Felt pretty cool, actually, since it seemed like I was the only person in all of NYC with this phone.
Well the store where I bought my girlfriend her black 920 (she was sold on it after I showed her my cyan one) said they were sold out of the red model when we asked if we could look at it. Then I also saw someone else in the store using a white model. Combined with the fact that the phones are front-and-center in the store (and presumably, other AT&T stores as well), my subjective opinion is that they seem to be selling fairly well.
I haven't see any in the wild yet. People see mine though and I get a lot of "cool phone", or "what kind of phone is that?", or the occasional "is that a Windows phone?".