This is a like for like recreation of a shot I found while trawling the internet. I can't find the reference for this so if anyone knows PLEASE let me know and I will credit it.
Post-production depth of field plugins have been round for a while and do a great job in production. That being said, when it comes to refractive and reflective surfaces and materials... well, a normal z-depth pass can't handle it.
Granted there are some obvious differences between the render and the photo but the test achieved what I set out to find out. (how rendered dof reacts for interacting reflective and refractive materials)