As well as your hardware, it also depends on your aa settings.

For me, the best settings I got was the image below.

I use both ENB (DX9) with AnKor's shadows and I can get a constant 60FPS no matter where I look and with a sharp picture.

I had to use the older NVidia driver (320.49) to get it to work right. Also, I used "enhance application setting" on purpose.