Which 6X42 do you have ? The latest one, the FX3 has slightly less than the older M8's.
The new FXII, 4X has even more than either of my 6X42's, or my M8, 4X. Provided you aren't far sighted as I am. Don't bother if you are. Turning the ocular out on the FXII, will cut down on the eye relief.
Haven't tried the little 2.5X Ultralight, but it's suppose to have more. The VX3, 1.5-5X is pretty good too, at least at the lower magnifications. E