SH5 is about in every way an improvement over SH4 _and_ SH3, just not at the current moment. It's a good idea to try to do something GWX-ish with SH5, but not to replace SH5 with a supermodded SH4.
Given time and some fixes from Ubisoft I have no doubt that SH5 + Whatever will eclipse GWX's amazing work with SH3, if only because of all the new tools and abilities the modders have available to them.
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