I'm trying to get some stats for the performance of the new 15" Retina Macbook Pro mid-2014 with the 2.8 Ghz upgrade (fully loaded). All the reviews I have seen so far are rather limited and only refer to the 2.5 GHz option. I would greatly appreciate any examples of real word use from anyone that is using the 2.8 GHz rMBP. I'm particularly keen to understand the battery life loss versus performance gain. The few reviews I have seen of the 2.5 Ghz rMBP 2014 suggest a battery life of 6 hrs 48 minutes (less than the 2013 2.3 Ghz). I'm also confused whether these battery life tests are done with the dedicated GPU switched off etc. I assume that if the dedicated GPU can be forced off it will prolong battery life considerably. Due to my work I feel that the 2.8 Ghz would be a big help but I don't want to be left with just a tiny amount of battery life during transatlantic flights. Any suggestions / advice / comments would be much appreciated!