May be feels hard when holding but flexier while swinging, 100zz is said to have similar feeling IIRC due to thinner 6.3mm shaft.
With racket technology so mature I am not convinced that any racket from top brands can be classified as unique, even though Yonex is trying so fking hard to instill the special/unique racket mentality using great marketing, 100zz and sister rackets are successful mainly because they are good and usable rackets than they are special. Enhanced sweet spot due to frame shape may be a new item from yonex, but if they are reducing frame size, increasing no of holes to make a concentrated sweetspot then I don't see logical point in new frame shape, may be it feels good to play.
I will wait for reviews, if I can find two good rackets from LN and YY each, I want to try both if I can buy them both, If I can only buy one racket I will go for LN for the following reasons:
1) Best durability,
2) Usually quicker in air,
3) Great QC and paint jobs.