I moved to a 930. As compared to the 920, the biggest differences are the screen size and the camera. Now with Denim, there are a few other features as well that aren't possible with the 920.
I have AT&T, so I don't get LTE on the 930. But, I don't miss LTE too much. I was impressed with it when I had it on the 920, but I don't complain about not having it now.
I don't miss glance at all. I just double tap the screen, and see what glance would have shown me anyways. Now, it's actually sort of weird to see a glance phone - as in "hey turn that off". On my 920, glance went off when the phone was idle anyways.
The 930 has a higher density screen than the 920. It's AMOLED as opposed to IPS. I personally like IPS better, but the 930 screen is a big step up from the 920.
I honestly don't notice too much difference in processor speed, because I'm not normally doing things that require hyper processing power. There are a few games that seem a little more fluid, but that be more mental than real - I can't tell.
On the whole, I think the 930 is the best phone I've ever owned. I would not have said the 920 was the best I had owned, but it was a lost-cost way for me to feel out WP. I really liked WP over the other OS's. Once I decided that, it was onward.