I have equipment both from M Audio and Focusrite. The Focusrite wins easily on sound quality alone. I currently have the Focusrite Forte, Focusrite Saffire Pro 10 and the M Audio fast track pro. I have 3 Behringer condenser microphones. They are fine. The sound is OK and they are 10 years old and still going strong. They don't perform like my Schoeps or Neumanns, but then again they cost quite a bit less. I have some Oktava MK012-01 microphones that are reasonably cheap and VERY good quality - almost as good as the Neumanns.
For measurement purposes as we are doing it, I don't consider the microphone to be the weak link.