Kohlert Winnenden Bb clarinet

I've bought & sold quite a few old Kohlert clarinets,  they are consistently available for cheap and once restored make fine players.  Up until now I've only worked on the instruments from Kraslice/Graslitz,  except for a Winnenden bass I posted about earlier. 
This is the 1st Winnenden Bb clarinet I've had.   I've been curious because the consensus online seems to be that the Winnenden era Bb clarinets are so so.....
And what did I find?  At first glance things seem similar, not quite identical to the earlier instruments but I can still see a resemblance.  This one in particular was very clean & original.....and ended up playing just "ok".   I'm not sure what it is,  I can't put my finger on it,  but they really aren't as good as the earlier Kraslice/Graslitz instruments.  Certainly not bad by any means, but I won't be going out of my way to pick any more of these up.