"Am I missing much with those upgrades ? I got a 100 EUR discount as this was an older model and not the latest."
Newer qr and Forks offer a more secure fixing than the older version.if you do forget to secure the older version and the wheel comes out the forks will proberly bend out of shape. That's what I did! So make sure secure. £100 to replace fork/mudguard and qr system.other disadvantage is more tools are required to remove the front wheel.
Newer Seat clamp holds better. Old version did not slip. Just that newer version goes lose enough for the post to slide down with out touching it. Also it allows another 1/2 inch insert as its a bit taller. However they both have a tendency to crack. see upgrade thread. £18 to replace.

You might have older lower pressure tyres also?
Sorry don't want to get you down on your new bike but you did ask!

Only the later effect the ride.
Mean while you have a lighter, stronger frame than a mezzo. And a better range of gears? How do you find it?