I have a Cort B4fl. The old model, that one with Mightymite pickups... Tell you the truth, it has the most confortable neck I´ve ever seen, it´s trully smooth, but unfortunately it does not sound as good as it plays.
I don´t know if it´s due to the fact that it have active pickups and they don´t sound as good in a fretless bass as they do in a fretted (I have another Cort, a fretted C5 with Mightymite as well, and I love that bass, both tone and playability are great). It certainlly have a deep deep low, but the tone does not sound as defined and good as I would like it to. Also, my bass is really friken old, that can affect it´s tone as well I guess.
Maybe the newer versions have a better tone, given that they come with Bartolini pickups - and word in the street is that they are awesome. Anyway, tone is a very particular thing, give it a shot, maybe it´s what you are looking for.