I have a zesty 714 (last years non-carbon model – carbon is for fishing rods, not bikes)
I have also test ridden a 575 at wheelbase in the lakes.
as others have said, the 575 is flexy in the rear end, pretty spritely though. I don’t like that wierd carbon pivot thing in the seatstays either.
zesty has a longer top tube which has allowed me to run a 50mm stem
I suspect the 575 could be built lighter
zesty basically fit me better, is stiff in the rear end with a 10mm bolt through axle
get rid of those fox forks off it (I have pikes on mine) as they will undoubtedly leak
I’ll be taking it to the alps this year (doing passportes on it as a test before 2 weeks later in the year) will be interesting to see how it holds up versus my nomad