I just mentioned Janek in a thread about improv so thought I'd kick back and watch a few vids of him. I've seen this video quite a few times before but today it really stood out to me how lyrical his improvisation is: http://www.youtube.com/watch?v=PRwtOibl_eU
Hadrien has got chops beyond chops but, for me, in this jam I much prefer listening to Janek. I know its a different instrument and style but his tone and phrasing kind of reminds me of Eric Johnson.
If I was going to give an example of an improvising bass player worth analysing to a student, I'd definitely let them know about Janek.