Haven't actually kept records on the two in a 5 year period to compare, no, but that would prove very revealing. Just my impression of the two. I run a small combine repair business in ND and get to work on all colors, and the JD's seem to need things with greater frequency. Not that they break down, they're quite reliable machines, largely. But when it comes to the longevity of major components, they are worse than most. Some other colors, like the Cat, can go several seasons before needing repairs beyond routine maintenance. Here we run corn, soybeans, edible beans, canola, wheat, and some barley, so machines tend to wear out faster and sooner than in a pure corn or corn_soy operation. So no, I don't have purely empirical data, just experience.