I have not paid any attention to Mega Man X in a looog time. The original X is still my personal favorite. I've always enjoyed the original Megaman more. It had better supporting characters and overall presentation imo.

The original Megaman was good but I haven't seen a real new one since Megaman 8 (which was good)
While I am unsure as to whether it is counted as an official sequel or not, the excellent, albeit extremely difficult Rockman & Forte was the last Megaman game created (for the Super Famicon.) It was dubbed as "Megaman 8.5" by many. I still don't understand why the original Megaman series hasn't seen a new game in almost 10 years though. There is even an in-joke about it in the fan translated version of Rockman and Forte.