Yes! It was a perfect fit for the 3.5 too! (The smaller KSF sheath for reference, does not fit the 3.5.)
This might be OT, but I just got the KSF Allegheny Pocket Sheath, and the Necker 2 is a very good fit for it! I'll try it with a 3.5 this weekend, which is my intended knife for it...