Without broadband stealth that would literally be su-57 - and that mostly because 5th gen fighter requirements are just incompatible with all aspect/broadband stealth.Au contraire friend! I think persistent high energy kinematics, broadband stealth, all around sensing, full suite EW, and especially ground up network centric focus are in fact by their parts and in their whole significant leaps above 5th gen rather than just an evolution.
Frankly speaking, it's a shame f-117n/c/x never went through - because it's possible to say that same package was in fact doable since the 1980s.
We've listed here specs and architecture approaches that appeared in 2010s, and which do absolutely separate 6th gen from everything before. I think it's more reasonable to look there. From there - different approach to air combat in general.
Other unique aspects of j-36 flow either out of them, or out of its unique range/mission profile.
Which, in principle, could be done in previous gens(fb-22/23; f-15e; etc), i.e. it isn't generational per se.