Sneak preview of the 2010 John Deere 9990STS with 946D header. Deere really pushed the boat out on this one with extra power, bigger grain tank, new draper header. When questioned the Deere representative said "yes the cleaning capacity is a definite improvement over the previous models".
Only kidding! Apologies to anyone offended, its only a bit of fun. I love Deere machinery but I have to question the wisdom of developing a new combine without an industry leading cleaning system size in it as CIH have done.
Some numbers for total cleaning area (just sieves):
CIH 6.90m^2
NH 6.5m^2
Claas 6.25m^2
AGCO 5.35m^2
JD 5.25m^2
I know well there are other important considerations to take into account when choosing a machine but you have to admit that JD sold themselves well short especially since Claas had their machines on the market long before the STS generation came out in 1999.