I usually play BC2 Hardcore which makes it hard to get high K/D ratios :< So my highest is 2.00 with 20/10... was playing as as amedic with a shotgun(solids) and Assault with M14/ACOG.
Oh, and I do have a K/D where I had I think 40/2 on BF2142, me and my friend were holding a point by ourselves, both as snipers (the standard one, we were not cheap) and most kills was knife or pistol... aah, good days