I know this is for Prepar3D, but I would guess, based partly on experience as well as screenshots of the new "whole state" version going for $5. I have the earlier Megascenery Hawaii (Oahu only) and there is very little autogen of any sort along with a couple of water masking issues around Pearl, even at full-right scenery settings in FSX Accel. On the upside, I am able to use certain commercial addons (Dillingham) and freeware in conjunction with it, and there some very nicely done freeware photosceneries for Kauai i and Ni ihau. None of which have much in the way of autogen.
On the other hand, with Megascenery releasing the whole state version as a slightly "flawed" product for $5.00 to cover bandwidth costs, it'd probably be worth it to grab (assuming it works in P3D). While I am not an accomplished scenery designer, I have had a lot of fun sprucing the Oahu product up with lots of my own custom made objects that I hope to share with the community in the near future. You can also noodle around with the product's scenery tiles - I did in order to alleviate the above mentioned masking issues at the mouth of Pearl Harbor. Hope this is in some way helpful.