Is there any optimization or improvement to take i7-8700K instead of i7-4790K for P3D V4?

As we all know , coffee lake architecture is ready to release in October  with  6 Core 12 Thread,which is named in i7-8700K.

Compared to i7-4790k(4 Core 8 Thread),is it necessary to  take i7-8700K instead of i7-4790K to get more improvement for P3D V4,especially in complex scenery and PMDG running condition? 

And how about i5-8600K?(6 Core 6Thread)

                                                                                                    Thanks for your suggestion.

                                                                                                        Yang.