Warmer as a guess, more colour. I don't use Oscons in analogue circuits and don't know the Lentek circuit so can't say for sure how it will sound. Nick knows his stuff so they probably mate well with the Lentek.
Oscons are low esr and can be useful in some digital circuits for supply decoupling. I'd imagine a very different flavour to tants when used in analogue circuits. Those Wima polypropylenes should be smoother in the high's than microphonic ceramics if used in say a LPF.

Give it a good running in, Oscons usually require longer than normal caps, they can sometimes be DC leaky when new too which usually goes away after plenty of burn in. Be interesting to hear how you find it