I am on mobile, so it is hard to find my links. I think pdadb.net is the site, search on Casio C811. Or look for specs for the Korean version, CA201L. Pretty sure it is dual core.
Edit:
Here it is
C811 (preliminary info): Dual core, 1800 mAh standard battery, but other places show a 2600 mAh or so extended battery. 16GB, 8MP rear, 1.3 MP front, SD card support, not showing an FM radio tuner, IP58 rated, 800 x 480 4" display, 6.1 ounces
S4 Active: Quad core, 2600 mAh standard battery, 16GB, 8MP rear, SD card support, shows an FM radio tuner, IP67 rated (better on dust than the C811, not as good on water), 1920 x 1080 5" display, 5.3 ounces.
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Edited on PC