I dont know if I can agree with that, I stopped using my old 026 after I got my 562xp, the weight difference was negligible and the power difference was very noticable. I've ran 044, 440mags, 372, and demoed a 572. Cant say I had the wow factor I did from the 50 to 60cc class. All outstanding saws, but not enough to get my money, owning saws smaller and larger.I think given the tree sizes you're dealing with (31.5") you might actually be a good candidate for the pro-level Stihl MS400 which is a light weight 67cc saw with a 51cm or 64cm light bar.
If this is outside your price point then I would probably look to the four kings of professional 50cc saws (in no particular order):
1) Echo CS-501P/CS-501-SX
2) Stihl MS261 (recommend 18"/46cm bar with narrow kerf chain)
3) Husqvarna 550xp Mark 2 (recommend 20"/51cm bar with narrow kerf chain)
4) Dolmar PS5105C
It's hard to get to specific with recommendations as you didn't specify where you're from. "Europe" is not a country haha.
I've never been a big fan of 60cc saws. They possess neither the lightweight and agility of the 50cc saws (which are nice to work with for extended periods) or the power of the 70cc class which makes up for the weight.