Hmm, it's not really possible to compare as you have to take into account the app type, the genre if it's a game or story, etc. Then there's the graphical capabilities, the size of the app, whether it's paid or free.
For example, my free RTS game that I made in 3 days for a contest with C2 in December 2012 now has 2,805 downloads, but there's no way I can provide a good comparison to the other game that comes up in a Windows Store search for "rts" as it is $6.99 and has way better graphics, depth, and multiplayer capabilities. However, in the search of the Windows Store for "rts" I find that both their game and mine come up in the first 3 entries in the list. Assuming that the search is tailored to each user, that might not be true for other people, so even comparing SEO ranking is tricky :S