As far as any difference between the V2 and V3 configurations, I moved from a pair of V2 M60s to V3 M80s and quite frankly the difference, to my ears anyway, was marginal at best, so to go from V2 to V3 M80s is something I doubt, in day to day usage, you could realistically audibly hear. Room acoustics and other issues(source: audio/video) will have a greater affect on what you are hearing than moving from the V2 to V3 version of the same model especially a large multi-driver floor standing speaker like the M80.
Differences are subtle, even though they are being described as improvements.
You would have to do an instantaneous switched A/B comparison to pick out the differences in V2 and V3. It is highly improbable that you would notice a distinct difference in day to day usage, unless you have yourself already convinced otherwise.