A bit off-topic...but with all the talk on this thread and on another about the MBP "only" having 16GB, I have a question...
I am using a MBAir w/ 8GB RAM and am easily processing, in LR, 42MB raw files from the D800E, including the odd image blend (panoramic and HDR). I do this with other apps open such as Chrome/Safari, Mail, Affinity Photo and, for web authoring, EverWeb. These 8GB of RAM in a 2012 machine seem to work without a hiccup. Image blends can take moment or two, but not frustratingly so.
My question is this... is the fact that the MBAir has an SSD the reason it seems to use 8GB of RAM so effectively? i.e. My guess is that it's "swapping" between the SSD and the RAM much, much faster than, for e.g., my older 2011 MBP also with 8GB of RAM but a HDD.
Furthermore, is it Apple's thinking that 16GB is "sufficient" for pro needs because of how fast "swapping" happens between the SSD and RAM?
I realize I am not doing video, nor am I doing high MB PS files, both of which would put much more strain on the RAM.
Anyway - some insight into this would be helpful, perhaps for the same reasons the OP is asking about laptops.