I went through all this before i bought mine. First off dont even look at the JD specs. there completely wrong. the 2520 is heavier than the specs say.
it will in fact lift quite a bit more than a 2320 on the loader. has duel pumps.
my service techs said thay proved it. by testing them. and the 3 point on 2320 will lift about 1100 pounds. though i have not tested my 2520 yet on this. service guys said thay had. and the 2520 3 point will lift much more. like 13 to 15 houndred pounds. its just a bigger heavier machine. and the engine design is different. the torqe curve is off the scale compared to the 2320. it was a no brainer for me. it is just more of a commercial machine.
as we always say. it depends on what you want to do with it. yes a 2320 is alot more powerful than a 2305. but people want to think the only difference in 2320 and 2520 is tire size. and thats just not true. there not even in the same class. i ran them both in dirt. and it was not hard at all for me to see witch was the more powerful machine. Best example is . Duc bought a 2320. kept it a few days. took it back and got a 2520. cause he wanted to do more work. that should say it all for you....
I know this is all just words. if you go run both in real world. you will understand what i am saying. 2520 runs like a big tractor.....
but i am only speaking from my experince. i am sure the debate will continue......

everyone would like to think there machine is top notch.
in fact , I almost bought a 3320 before i got the 2520. I know its a more powerful machine. but i felt it was to big for my needs. and i figure there close enough in performance. i can do just as much with the 2520 as i could with the 3320 just not as fast. i have certain areas it would be hard to get a 3320 in. so i had to make a choice. I felt it was the right one for now. if that changes. thay still sale 3320's....

thats why i bought all my attachments big enough to work on the 2520 or the 3320. so if i decide to go bigger. i dont haft to buy them again....Like looking into the future so to speak....
