Hi, I'm going to buy a rMBP 15in dispite de price (was looking for the 13in but 4k support is something I may look in a near future so...) do you think the upgrade of cpu to 2.3 worth it ? Lightroom and light photoshop is the more cpu intense things I'm doing on a daily basis. I know the upgrade is not pricey but nevertheless i'm way over my budget. And I suppose it's impacting the battery too ? 2.3 ghz must drain more battery. Thanks!