yaar, Farcry uses comparitively old engine named crytek sandbox engine. But the crysis uses cryengine 2 and it supports directX 10. So, you should not even think of comparing these two games.
anyway, you have asked the question and i must answer it. FARCRY rules,rocks,shouts,shoots,gonuts, and everything. It's an awsome game created in that genere. We can't expect anything better. The two main things i like in FARCRY is the visuals which are awsome even with a rig having 256 mb ram and 32 MB Vram. And the second, The AI. Farcry has most challenging AI in this industry.
thats all.