marginally at best. It uses the same architecture as haswell and will provide roughly the same processing performance.
Which is essentially what I said, better power efficiency.
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It really comes down to a need vs want. If you need it now, get it now. The current model is great. If you want it, it depends how much you want it. There will always be another model a year out. I'm using a 2011 MBP that is meeting my needs but I'd like a newer model. I was waiting for Broadwell because I don't want to get a laptop with a processor that came out in 2013. At this point, Skylake is supposed to release in the second half of this year, I might just wait for that.