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I'm guessing 28mm is the most common just due to the sheer amount of people who are transferring from Warhammer Fantasy, but what are the rest?

Server move at some point.

28mm is the default. 10mm and 15mm are played too. 28mm must account for 95% or more of games played though I would think.

28mm. Mantic sells everything at 28mm, Warhammer is 28mm. 28mm is default, other scales are merely possible, not necessarily supported.

Me and my group has recently started playing KoW in 6mm

Really? Are you doing historical or fantasy?
I've been thinking the KoM list is so versatile it's basically superseded the need for Hour of Wolves' historical KoW v1 supplements. It'd be interesting to hear from people who've actually played historical only, is that the case here?
On point, I've played it with WM figures (10mm) without hitches. The basing being what counts, the only thing I found frustrating was the wheeling near melees etc...
But it was basically a modified version of the game as we used cm over inches with a troop 20x40mm so can't blame the rules per se.