I haven't seen on forums comparison of these two production line , they have the same technology C4 , and except some small differences in joint , ability to change weight in blak 2nd generation there is no other big difference in playability , I tried ikon 1 and blak4 i havent noticed any difference ... so my conclusion is you pay, buying blak series, just looks not some extra performance difference... of course blaks have ebony material on c4 core but that is also all about looks , what do you think ? i would like to hear some thoughts of blak predator owners ?