There are some posts but you're not looking hard enough
P99 is about 19.0 shots-per-second.
MK14 is right around 10.0 shots-per-second.
Five-seven and USP .45 are faster than MK14 but I can't remember the speed something like 12 sps.
The rest of the pistols are slow maybe slower than the MK14, I'm talking about the python etc.
The gist here is that every single-fire gun in MW3 has its own unique speed, while in the past pretty much all the guns were in the same ballpark. In Black Ops the M14 seemed a little slower than FAL and the akimbo CZ75's were the fastest but not as big of a gap as the P99 which is twice as fast as anything else.