I have the MBP Retina, 13" Late 2012. 2.9 GHz i7, 8 GB memory and 500 GB Flash Storage. I'm considering upgrading to a newer MBP. Possibly this: 2.5GHz dual-core 7th-generation Intel Core i7 processor, Turbo Boost up to 4.0GHz 16GB 2133MHz LPDDR3 memory 512GB SSD storage Any opinions or suggestions? Will I notice much difference in this machine and my old one? Thank you in advance.