A:Answer Touchscreen is VERY responsive because it uses a capacitive touch screen as opposed to a resistive touch screen - look them up on wikipedia for more details.
as for better than nex-4000... sort of. The NEX-4000 has an old resistive touch screen so -1 for that. however the nex-4000 supports DVDs, all smartphones (not just carplay like the ilx-007), bluetooth, aux input etc.
However I would highly recommend the pioneer appradio 4 (sph-da120) as is is like the nex-4000 except it has a capacitive touchscreen and a similar price tag.