Performed today on 3 yrs old Retina 15" with integrated Iris Pro 5200. Temperatures dropped considerably, both during idle and load periods, but BE AWARE, if you pass control to the fans via i.e.: smsFanControl, during testing laptop reaches abnoxious temperatures (98C) - what it seems is that when smcFanControl is taking over, also throttling is turned off, therefore, when temperature rised you need to rise fan rpm (during Geekbench 3 I set it at the end to the 3800rpm from 2500rpm it was and this dropped immediately from 98C to 70C). When SmcFanControl is set to Default, MAC UEFI controls fans and - what is funny - when load exceeded reasonable thresholds, (one core reached 92C) it throttled (probably) because without much rpm raise - this dropped temps to 75C (Default setting did at critical point two things: a) from 2160 rpm to 2890rpm and b) throttle ... what ended in immediate drop to 75C). Keep that in mind.
In this aspect I consider this as a smarter management.