I can't take fotos of K26/81 for size comparison, but the ear-cushion diameter measures at 2.75" or 67mm. The donuts are about exact my ear size so it sits pretty comfortably.
Please note I recognize some clamping force in the headband. But it's improving over time as I'm stretching them out.
Also the rotating pivot between the headband and cup is so tight, not a bad thing at all, it makes squeeky sound when you move your head.
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