Ben
I am not aware of any oversized HO F units.
After the Varney, Gilbert and Marx F3 units everyone pretty much did direct copies of the Globe/Athearn F7. Fleischman, Marklin, Revell, Penn Line, Cary, Cox and Bachmann are all about the same size. The Atlas/Rocco FP was a tad undersized IIRC. All the “modern” Fs ( Stewart, Genesis, BLI, MTH, IM) are scale and have decent nose contours.
I think somebody on Shapeways is offering a 4mm Scale F7 (??)
Charlie Vlk