.... in order to use it's full sensor the anti-aliasing filter is needed, and it's more expensive than the camera.
No need for that , I've had a 5d2 since 2010 (shooting news stories & short Doc) and hasn't been a issue at all
Comes to the lens quality & shooting technique.
Does 5D Mk II have any advantages over 100D when shooting 1920x1080 crop? That is, in the no lines skipping mode.
I thinks so , Bigger Sensor , Less Crop factor (Full frame - 36mmx24mm) to (APS-C -22.3mm×14.9mm Crop factor 1.6x) fast storage (CF Card - 75-80MB/s write speed)
In Crop_Mode 5d2 does 3008x1080 @ 24fps & or 2784x1160 @ 24fps , crop factor is 1.85 (3008x1080) 2.02 (2784x1160)
100D Crop factor is higher in crop_mode , e.g. 5184( full horizontal of 100d sensor) , So 5184/3000 = 1.72+1.6(crop factor of full frame)=3.32 crop factor
24mm=80mm where as the 5D2 crop factor at the same resolution (3k) 24mm=44.4mm
There's also experimental crop_rec builds
here , if you what more resolution up to 5.6k
The 100D does also have experimental crop_rec builds , so it all depends on your requirements for your videos/films projects