I guess many of us were waiting for this: the possibility to use Sigma's excellent…
New Camera Databases (for specs, comparisons, etc)
There are new camera databases for you to check, and obviously to use. You may find it useful to learn more about existent cameras and lenses:
Digicamdb.com: Easily find sensor size, pixel pitch and other important sensor characteristics for 3284 digital cameras.
Mirrorlessdb.com: Full specs of all mirrorless cameras and lenses.
Lesnumeriques: A french camera studio image comparison.
Google docs file: Mirrorless Camera Native Lenses