A lot, as I was active while this happened. Guess I will list them all:
1.
2.
3.
4.
5.
6. (lost more than 50)
7. (lost more than 100)
8.
9.
10.
11.
12.
13. (lost more than 50)
14. (lost more than 25)
15.
16.
17. (lost more than 50)
18.
19.
20.
And I think a few more, but only like 5 upvotes or so for each of the rest, so it is dismissable. Essentially, almost every image uploaded on the last 48 hours or so. Said images also outright lost some comments, and I myself did on that same lapse, although that is a lot less important.
With that said, I understand that trying to restore one user's data was what caused the whole problem to begin with, so honestly, I am mostly interested on getting reassurance that things are fine now more than having past upvotes restored.