Hey Shen, bin auch aus berlin und kenne dich und deine arbeiten noch aus dem guten alten c4d-network, daher herzlichen dank für das lob! :)
The dof is really a bit strong now when you say it... There was something about the first picture, that disturbed me a little but I couldn't figure it out.
On the other topic: I rendered it out in 2000px size, because it was only meant to be shown in the internet. I might be wrong, but I don't think, there will be much or any noticable difference in rendering big and then scaling small.
cheers!