I am a power user who is going to be living a life on the go starting at the end of the year and need a little advice on what MBP to buy. I do a lot of video editing so ideally need something that can somewhat handle 4k RAW DSLR footage. I have been considering getting a top of the line 2015 model as according to the geek-bench scores they compare well to the newer ones when it comes down to price and I have no preference when it comes to the design. I also read today about the potential for i9 chips in the 2018 refresh. so my question is 3 fold. for raw performance (CPU/GPU) are the 2016 and newer models actually more powerful than their predecessors? if so how significantly? and should I maybe just wait for the 2018 refresh as it could be quite dramatic?