Hmmm...so I've done more listening to them last night and today, especially comparing to the suite of Crossfades that I have.
I still feel that the new M-100 Master has rather tame mids (lower mids to be more specific), which to my definition makes it have a somewhat typical HiFi-ish U-shaped sound. Therefore it's somewhat easily likeable for the average listener however I feel I do prefer the Crossfade Wireless Codex (listening to it wired) a little more. I like a little bit more flesh to my vocals.