Looks like JD did beef up the H180 loader weight specs over the 400x specs, though the loader lifts about 3" lower. They pretty much all use a standard bucket for the measurement... Not a whole lot of weight variations with a 72" wide hunk of metal. Here are the numbers of competing large CUT cab tractors as published (in order of lift weight @ 500mm). Note that Deere has the lowest 3pt lift of any the competition. Also note, that the Kioti & Mahindra loaders were not fully represented because they do not post lift numbers at 500mm... However they do list the highest weight lift potential at the pivot pin measurement ... FYI.
TRACTOR----LOADER MODEL-----3PT LIFT @24"-----LOADER LIFT @ 500MM-----LOADER LIFT @ PINS-----LOADER LIFT HEIGHT
Massey 1758----DL130--------------3084lbs--------------------2056---------------------------2527-------------------113.5"----------
Kubota
L5740--LA854---------------2980lbs--------------------1878---------------------------2489--------------------112.3"----------
Deere 4066R---HL180nsl-----------2500lbs---------------------1846---------------------------2486--------------------109"-----------
Kubota
L6060---LA1055-------------2976lbs--------------------1784---------------------------2361---------------------112.3"----------
Deere 4720------400x---------------2500lbs--------------------1742---------------------------2368---------------------1128"----------
Mahindra 2555---2555CL------------2945lbs--------------------N/A----------------------------3122---------------------115.4"----------
Kioti NX6010-----KL6010------------3177lbs--------------------N/A----------------------------2761---------------------108.3"---------
TYM T554---------TX55--------------2945lbs--------------------N/A----------------------------2478---------------------109.8"---------
LS XR4046--------LL4102-----------2756lbs---------------------N/A----------------------------2500---------------------96.1"----------