Xbox One
Scorpio
There are several things to note about these comparison pics; The X1 pic is from photomode which means the lod is at its maximum, while the Scorpio shot is a gameplay shot with a free camera. You can't do that on an X1 because the Scorpio shot is a dev shot. If you could do that then the X1 shot will match the Scorpio LOD. Photomode always loads assets at their maximum.
Also, the Scorpio shot is from a "ForzaTech" which is the name of the engine used to develop the Forza games. The reason you can't get the same "look" on F6 is probably because that pic is more representative of what F7 will look like. Richard noted that the have dynamic weather on, that's not available on F6 so its likely that F7 will have dynamic weather, The pic also shows signs of this; the sky is overcast with the sun breaking in, the ground is wet yet the cars are not.