I have never shot the old 100D Ektachrome. I just projected some old ASA 10 Kodachrome from the 40s/50s the other night and holy cow its the sharpest, most colorful film Ive ever seen. I also projected some best light workprints I had made at Fotokem from Vision3 50D (overexposed a stop at 25 to tighten the grain, but processed normally, no pull processing) and I would say that it is the second sharpest 16mm Ive ever projected. 50D has a beautiful color palette, but still cant touch that old Kodachrome look. So I hope this new Ektachrome looks even better than the 50D.
There are some negative aspects like the lack of exposure latitude and the fact that youre running the original film through the projector.