Logically, every one of them has always been a tadge better looking/feeling/sounding/etc than the previous one, although there are certainly also things they got wrong here and there, where I, for example, would prefer some features from FS9 over overhauled ones in FSX that work less well or are simply just not right... But they don't always get it right or right enough, cause all the serious MSFS pilots I know always use much better 3rd party addons over the stock planes. So perhaps they're not as good as everyone always says or as they could be.
As an avid flightsimmer though, I'm keen to see what this leads to and have been following it since they announced it, but not buying into the gimmick too much, I've known them too long to buy into any marketing tricks.. hehe