(I'm sure you know that I'm not using the word 'felt' in the sense that uke physically feels anything before the blow arrives. No Ki balls here.) That said...
I doubt it Conrad. But even at my slightly advanced age, I still have respectably quick hands, and going full bore there isn't much for uke to notice before the blow arrives. Still, I've been told by people I train with that they definitely feel something coming at them before they notice there's a blow on the way.
What I am working towards is getting exactly that reaction from uke, regardless of how sensitive uke is and whether or not it's a practice situation.
Thanks for your observations.
Interesting. Thanks for the clarification. I'll be thinking about this some more.