...the Rode NTK and the NT1000 (same as the NTK without the tube) have been longtime favs of the Hiphop community...haven't heard much about the NT2A in that regard...it has a different capsule than the NTK/NT1000 series microphones...I have an NTK, 2-NT1000s and a Rode K2 (same capsule as the NT2A), and I track both rap and dancehall reggae vocals in my studio...the NTK and NT1000 both get the most attention from artists (the main difference is you don't have to wait for the NT1000 to "warm up" as you do with the NTK tube-design)...
...sibilance is an individual experience based on a particular microphone coupled with a particular vocalist...condenser mics tend to be a bit more sibilant than their dynamic and ribbon cousins, but in most cases sibilance can be minimized by proper mic placement and off-axis recording (or even Harvey G's pencil trick)...what is sibilant on your particular voice may not be so on another vocalist...the essence of sibilance is more the direct result of the diction of the vocalist, rather than the character of the microphone...if you have a particular issue with sibilance, you should be giving a good dynamic microphone like the Shure SM7 a shot...sure cure for "essiness"...
...in my experience, neither the NTK or NT1000 exhibit any particular susceptability towards sibilance, at least not any more so than many of the newer, somewhat "brighter" sounding LDC microphones...while the dynamic and ribbon mics don't exhibit as much tendancy towards "essiness", they also sacrifice some of the "airy" sounding high-end that makes the LDC mics sound so open and clear...