I have a high-end pc and the patch improved the game for me, I still have some stutters though.
Here is my latest test vid, if you jump to about 2:15 you can see some nice ground scenery and the little bit of stuttering I have. Still it did not affect my playing though. Was recorded during play (1920x1080).
Settings - Everything set to max it can go
1920x1080
Roads / Grass - Off
Shadows - On/Off on some clips.
i7-2600k
16 gb ram
gtx580 1.5gb
game installed on SSD