This data [0] doesn't have the latest models, and it's meassuring latency internaly, not "touch-to-sound". The ones they tested average around 7-8ms. I've heard of <10ms as the benchmark for "instant" in audio.
Edit: I've been thinking about this and a touch-to-tone latency below 10ms seems imposible, even with the 120hz digitizer on newer iPhones. I would be very interested in seeing some experimental data as well.
Edit: I've been thinking about this and a touch-to-tone latency below 10ms seems imposible, even with the 120hz digitizer on newer iPhones. I would be very interested in seeing some experimental data as well.
[0] https://juce.com/discover/stories/Mobile%20performance%20ind...