Has anyone tried comparing the Z 600mm with stacked 1.4 TCs (one internal, the other external) vs the lens with just an external 2.0 TC (internal TC not engaged)?
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I've seen the comparison go both ways in online commentary. My impression (from reading; not from direct experience as I do not own the 2x TC) is that the difference is small enough that it is within the margin of sample variation. Personally I would choose based on whether I wanted to be able to switch from 1.4x to 2x, or from 2x to 2.8x.
If you're interested in quantitative data, Photography Life has MTF measurements for the 600 f/4 and the 400 f/2.8 with all combinations of TCs, as well as various other lenses. However, I believe their measurements are only based on one sample of each lens.
Are you meaning you would like to know which has the best IQ, 2x 1.4x TC vs 2x TC? See Photography Life's test results which show there is virtually no difference. However, as other's have stated, there may be sample variations between individual TC's, the internal TC and the lens itself:Has anyone tried comparing the Z 600mm with stacked 1.4 TCs (one internal, the other external) vs the lens with just an external 2.0 TC (internal TC not engaged)?