I have the EpIV Vader saber in my collection and it is probably the most accurate FX saber hasbro has to offer. I dont have any of the Master replicas non-fx hilts to compare, but I have seen pics comparing the new vader IV (with removable blade) with the master replica hilts and the new vader is almost similar in thickness (it is slightly thicker than the non-fx hilts, but the difference is so slight that you will need to look at them side by side carefully and with calipers in order to detect any difference). Hasbro has really slimmed them down.
Here is a pic comparing the vader to a rotj Luke hero.
Here is a pic comparing the vader to a rotj Luke hero.

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