Yep for me using x4 MSAA and a single 980, grass is the trade off if I want 60 fps in all situations. I will trade fluffy fields for jaggies every time. Whilst I have tried high n very high grass in the past the hit on FPS is just too great. I have all the other whistles n bells so one less is not a problem for me. I love how my game looks and 60fps makes it that much more enjoyable...
A 980 must hammer a 290x at 1080p, no way a 290x can handle 4xmsaa. I guess it doesnt matter at higher resolutions as amd seem to catch up then.
I know what ya mean about getting 60 fps though, looks much more natural, especially with crossfire, things get stuttery real fast when ya not getting 60 with crossfire.