Connor, the fairer comparison would be with Thru-Hiker's M90 (same price point and both around 1.0 oz/yd^2 whereas m50 is noticeably lighter).
Honestly I think at this point we are splitting hairs. At these weights there is really only two categories of fabric: quality and junk. Quality means a working DWR, acceptably downproof, not fragile (not necessarily robust, but nothing that will fall apart under normal conditions).
Junk is basically anything too weak to be trusted, leaks feathers, or no DWR.
So at the ~1.0oz/yd^2 mark we have Intrepid, M90, and now Pertex available for the MYOG community. They'll all be good enough with minor variations for tweaking application use (beter down proofness vs DWR vs breathability).
In the ~0.7oz/yd^2 realm we have the new M50, KG-8D, and SevenD (the latter priced much higher than the newest entries).
Either way, thanks for letting us know! While I'm sure there's minimal differences in quality, it is nice to see such a big brand fabric available to the MYOG crowd (*hint* eVent *hint*). And more options is always good for the consumer ;)