I guess the closest we have been is the kondinin group report from a few years ago. It's old news now but someone might be able to find a link to that report.
They tried To do it Again this January in the wimmera but apparently some red tape and / or legality BS prevented it from happening. I think some brands were tested but the results haven't been published. A member on this forum would know how it all panned out.
One would think with the number of machines in the US and Canada that some sort of test would be conducted every few years? One would even like to think the big name manufacturers would even encourage testing so they know where they stand and what changes they should make.
Not sure if you want personal opinions buzz, but here goes anyway. As you know we run two shades of green, have run two colours of red, had a couple of silver, and ran a yellow. Based on what I have seen I would say, today, in AUS, in Cereals, the NewHolland would be on top for overall throughput. Lexion second, but a well chipped S88 gleaner would probably be its shadow. They have big potential. The Silent achiever.
If our harvest wasn't so rush rush, go go, us contractors / and or farmers, could all get together in some good crop and do our own testing, useing Rods Harvest Calc. No lies, no guessing. Just straight out facts and figures.