I compared a stereo pair of MKH 8020s mounted in a DIY foam SASS, with a pair of Audio Technica AT 4022s mounted in a Crown SASS.  These are consecutive recordings (rather than simultaneous), it was early dawn on Xmas morning, rigs were set up on my front verandah.  By ear I cannot pick the difference between the two rigs, but a sound spectrograph shows that the 8020s are a little noisier.  Both rigs alternately ran to a Sound Devices 702 recorder, I added 3 db to the 4022s in post, to match the levels.

SASS RIGS COMPARED: MKH 8020s v AT 4022s

Vicki Powys