Commons vs. Wikidata: Total Active Editors (An 'active editor' is a registered (and signed in) person (not known as a bot) who makes 5 or more edits in any month in mainspace on countable pages.[1])
Active editors on commons.wikimedia, Commons at a glance December 2014: Active Editors (>5 edits) 7,041; More Active Editors (>25 edits) ~3,000; Very Active Editors (>100 edits) 1,361
4. Why participate? Preliminary results of the Multimedia participation survey (October 2009) as part of the Multimedia usability project.
6. From which projects? (Referrers)
Likelihood to participate in Wikimedia Commons depending on the language of origin. Three groups stood out. Respondents coming from Wikimedia websites in Arabic, Bulgarian, Catalan, Czech, Danish, Finnish, French, Hebrew, Italian, Dutch, Norwegian, Polish, Swedish and Chinese language are correlated with regular participants in Wikimedia Commons. Users from projects in German, Hungarian and Vietnamese language are in a similar but less pronounced situation. On the other hand, respondents originating from a Wikimedia project in English, Japanese, Portuguese, Russian and Turkish language show the opposite correlation: many of them do not participate in Wikimedia Commons. The size of Wikipedia does not seem to be a decisive factor; we suggest that policies and culture on each wiki are, in fact, mostly responsible for these differences.Wikimedia Commons - Evolution of content vs participants. Isotype-style diagram showing the temporal evolution of the number of media files & participants on Wikimedia Commons. Data is based on stats.wikimedia.org for January of each year. (2010)Demographics English Wikipedia and Commons
Commons-coverage map visualizes geolocated images in Wikimedia Commons
Commons geolocated files stats: *Mid 2010: 0,63 million *January 2012: 2,9 million *February 2013: 3,5 million *April 2014: 4,39 million *September 2014: 4,92 million *February 2015: 5,257 million (files directly in Category:Media_with_locations) *June 2015: 5,57 million geolocated files (which is 21 % of all 26,3 million files in Commons)
on commons.wikimedia: ~700.000 files with no Information (or similar) template. quarry query (Takes too long to run (~1h) for Quarry ; result on 2014-09-04 was 697.814 file)
~533,000 files out of ~24 million on 11 December 2014 [2]
MrMetadata - File metadata cleanup drive (Global tally: Total number of files: 2,507,335 ; Files with missing machine-readable metadata: 1,247,380 ; 51% complete. As of 2014-12-10, these numbers include Wikimedia Commons.)
MrMetadata: commons ~532,293 Files with missing machine-readable metadata (on 2014-12-13)
MrMetadata: commons ~443,370 Files with missing machine-readable metadata (on 2015-06-02) (~1% of Total number of files: 26,226,302)
commons:User:Bawolff/usage stats: As of July 2013 we have 17,649,274 images on commons. 7,109,880 images are in use outside of commons, or 40.3% of images are used.
Picture this! Magnus Manske, November 24, 2014: counting the number of items with images on Wikidata and Wikipedia (by default, navigation bar logos and various icons are counted just as actual photographs of the article topic -> crude filter, counting only articles with images (one would do) that were not used in three or more articles in total.) (English Wikipedia failed to return a timely result; and since its generous sprinkling with “fair use” local images would inflate the number anyway, omitting this result here)
Site
Articles/Items with images
dewiki
709,736
wikidata
604,925
frwiki
602,664
ruwiki
491,916
itwiki
451,499
eswiki
414,308
jawiki
278,359
magnusmanske.de, June 8, 2015: Wikidata has passed German Wikipedia in terms of articles/items with an image of the subject, and is now only second to English Wikipedia in that regard. (743850 dewp articles vs. 804885 items)