Valid opinion, as they did record an album with Shearing for Jazzland (available on OJC CD).
I already mentioned that record, and no, the Mastersounds didn't record with Shearing. I'm still not convinced that it follows from the fact that the M brothers recorded one album with Shearing that the Mastersounds (a quartet with no guitarist) resembled Shearing's groups.
I think you might be making more out of the comparison than I intended. Didn't mean to suggest taht they were like Sheraing, just that they were closer to Shearing than they were to the MJQ in terms of overall ensemble sound. Not solos or groove or anything or anything, just the way they played their heads
What I've heard of The Mastersounds (the KISMET album and a few odds and ends here and there) has featured heads that are played as a unit over a "regular" rhythm, not the emphasis on melodic and rhythmic counterpoint that so many of Lewis' compositions called for. Plus, they played more "regular" type tunes. And, although they indeed swung, they did so in a relatively "polite" manner (again, based on what I've heard), yet not in the all-out "chamber" manner of the MJQ..
Noe of this means that they sounded like Shearing's group, or any thing like that, it just means that in the vibes/guitar sound (and if you're referring to The Mastersounds without Wes, I can't comment. Never really heard them, at least not that made any impact), they lean more towards Shearing than MJQ, without really going too far in either direction. It's a "realtively" thing, that's all.
I mean, I could see the Mastersounds appealing more to Shearing's crowd, who liked "recognizable" material "nicely" played, than to the MJQ's, who no doubt appreciated for whatever reason(s) the "highbrow" element(s) of the group.