Hemisent welcome aboard! Graphic-wise I think SF favourably compares with TvsT and Achtung Panzer( which by the way is made by Graviteam).
The graphics may not be on par with Crysis but frankly no disappointment.
Make sure you have the Steel Panzer Mod 1.5 beta installed as it is the latest and most complete mod.
Make sure you check the Graviteam SF forum also as it contains lots of interestin g info on SF here´s the link ;
http://graviteam.com/forum/index.php?board=1.0
Cheers