I have an engineer friend who has used these and he says they are almost identical sounding to the 121.
A couple years ago we did a mic shootout on a string quartet with about 6 different pairs of mics including some 121's in blumlein.
They were, without a doubt, the most natural gorgeous sounding pair...and we had some other great mics in the mix, including cmc6/mk4's, km84's, senn mkh's, and even an LSD2 for fun.
Just throwing it out there, but I bet this mic would be a huge winner for acoustic music.