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. Note that Deere has the lowest 3pt lift of any the competition (not sure why). Also note, that the TYM, LS, Kioti & Mahindra loaders were not fully represented because they do not post lift numbers at 500mm... However the Mahindra & Kioti loaders list the highest weight lift potential at the pivot pin measurement ... FYI.
TRACTOR----LOADER MODEL---3PT LIFT @24"---LDR LFT @ 500MM----LDR LFT @ PP---LDR LFT height-----LDR LFT 59" @ PP---LDR LFT 59" @ 500mm
Massey 1758----DL130------------3084lbs---------------2056------------------2527-------------113.5"-------------2648-----------------------2299---------------------
Kubota
L5740--LA854-------------2980lbs---------------1878------------------2489-------------112.3"-------------3097------------------------2509---------------------
Deere 4066R---HL180nsl---------2500lbs---------------1846------------------2486--------------109"---------------2957-----------------------2022---------------------
Deere 4066R---HL180msl--------2500lbs----------------2178------------------2477-------------109"---------------2944-----------------------2825---------------------
Kubota
L6060---LA1055----------2976lbs----------------1784------------------2361-------------112.3"--------------NA-------------------------NA----------------------
Deere 4720------400x------------2500lbs----------------1742------------------2368-------------1128"--------------2701-----------------------2154---------------------
Deere 4720------400cx-----------2500bls----------------2571------------------2383-------------112.8"-------------2696-----------------------2639---------------------
Mahindra 2555---2555CL---------2945lbs----------------N/A-------------------3122-------------115.4"--------------NA--------------------------NA---------------------
Kioti NX6010-----KL6010---------3177lbs----------------N/A-------------------2761-------------108.3"--------------NA--------------------------NA---------------------
TYM T554---------TX55------------2945lbs---------------N/A-------------------2478-------------109.8"--------------NA--------------------------NA----------------------
LS XR4046--------LL4102---------2756lbs----------------N/A-------------------2500--------------96.1"--------------NA--------------------------NA---------------------