Thank you for all the comments! To be honest, I didn’t really expected a welcome this warm, since all I was doing in the last few weeks was looking at these images. 
Pixelab: The highway is full 3D, however, the perspective is a bit distracting. The 18mm lens with some vertical shift gives a false impression of perspective,a bit distracting actually. By the way, this was a fun part to do. Since the hedge separates that particular shot into two isolated spaces, we had some space to experiment with motion blur detached from the main scene. Also must note, that in SP2, you indeed can render noiseless glossy effects. Hurray!
DVP3D: Yup, people upstairs look a bit large compared to people at the exits, although all are the same 3D meshes copied around. Again, do to the shifted lens, and also thanks to the simultaneous contrast effect there. Looking back at that region, I would definitely scale the closer people down a bit.
pailhead: Backdrops are there to create the distant background. I figured it would be easier to manage reflections and aa issues, if I would just include every 2D footage into the scene as 2d planes, and mapped boxes. We had a rough approximate environment based on site plans and google earth, and mapped those with the pictures available. The night shots however were terrible. We were assured from our client, that we will get quality photos from their inhouse professional photographer to work with, so we don’t have to waste our precious time (big bs.) on field trips and taking photos. So their pro photographer went out in the middle of the night and took some crappy photos handheld(!) with an iso rating so high, we couldn’t even separate the building from the background. We are planning to get a 2m print from the night and day long facade renderings on our wall, and will definitely redo the backgrounds from our own footage. Enough rant, some facts now: Yes, apart from the 2,5D distant things, everything is there in full 3D. Till the last minutes of the deadline the client wanted to keep the option of changing camera views, so it was better having everything in 3D. The interior of the building is also modeled and furnished, so in the end, there were about 40.000 objects in the scene, including vegetation, and not including the additional handpainted 30.000 fallen leaves. This much also to be able to change cameras any time. 
Displacement on many, many surfaces (mostly the rattan furniture also invisible in these renders, but a necessity for closeups), and a great sum of area sampled VRay ISO lights to handle all the artificial illumination. We had to design the lighting by our selves, I’ve chosen erco luminaries to do everything since they’ve got a good product range, and lights with beautiful, even distribution. And I was trying to stick to erco’s specifications as close as I could.
Hope this was informative,
Best regards,
A.
