The 8820 is a bigger and better built combine period. 860 has a 60" cylinder...8820 has a 65" cylinder. More H.P on the 8820. longer straw walkers also on the 8820 II. Cab bigger on 8820, although still smaller compared to the newer combines. 860 has electric_hydralic thumb swith for header, 8820 still has lever on steering column. We ran an 8820 series 11, and in 5 years had one small breakdown for 20 minutes (key stock get loose and slip out on return auger on top). We ran a new 860 for 2 years, and it was broken down for a mininum of 20 minutes a day. As for actual capacity, the 8820 was on average 20 % faster but at the end of a few weeks, would do about 3-1 of the 860, because of numerous breakdowns of the Massey. Our 8820 is still running about 15 miles from us, and the guy that bought it said that it still runs like a top. Our 860 that we owned is about 60 miles away...at the combine wreckers, along with rows and rows of Massey combines, compared to a few John Deere's.