I have upgraded from fold 5 to 6 and it's a good one. Not much features are improved but you can work on it and samsung gave me a good trade value which helped me in the upgradation.
Upgraded from a Fold 4. This one is slimmer, lighter, and feels like it runs faster when I have multiple apps open. I have yet to learn all the new stuff it can do but it was worth the upgrade so far. The camera quality seems the same though. I do wish it would charge a little faster.
Fantastic phone! I upgraded from the Z Fold 5. The difference is how smooth this phone operates compared to previous generations. The hinge is improved yet again, with less effort to open and sitting flush when closed. The battery life appears to be slightly improved, though I was impressed with last year's version so that's a bonus. Samsung managed to squeeze out a little more screen while maintaining the same form factor, another knock out of the park for Samsung!
This phone is absolutely amazing. The only reason I do not give it 5 stars is because it does not have a built in S Pen like the Ultra. The day that happens, it will be the best phone ever for me.