Yeah have to agree to some extent in dimishing returns.......but I guess they are putting some serious man hours and premium materials (like you said) into everything this time until QC checked and nicely packed, so the pricing.
Speaking of kz, They showcased many possibilities in the budget IEM world, like micro dynamic,wooden shells,tunable filters,dual dynamic,miniature shells,introduced atheir own built-in amp with a model to custom the sound,and lastly the dual hybrids and the removable cables, still within the impressive lower price point.
And we have seen their models bassy,trebly,balanced,good/avge SS and vg imaging,fun,U'ish etc already so I wish zsr pro cld be a strong one in mid-centric,huge SS with all 3 areas even, and pin point imaging and oh, the tough call "the coherency".
yeah,expectations are high when the price goes up.