No favorite image in the post... I like the detail, composition, technical aspects of them all. Difficult to choose just one image.
The review on the D4 that I read, said something like it's a pro camera where, if you don't know what you are doing, you will get more poor images faster than with any other camera... but if you know what you're doing
... obviously the latter.
I agree with Echi, that you can see a difference in quality... and/or maybe it's just that the spark has returned... good choice.