I haven't seen data for the A14 big cores, but in Anandtech's Tiger Lake deep dive, they did make a comparison between the power usage of Apple's A13 cores and

I haven't seen data for the A14 big cores, but in Anandtech's Tiger Lake deep dive, they did make a comparison between the power usage of Apple's A13 cores and Tiger Lake. >Comparing it against Apple’s A13, things aren’t looking so rosy as the Intel CPU barely outmatches it even though it uses several times more power, which doesn’t bode well for Intel once Apple releases its “Apple Silicon” Macbooks. https://www.anandtech.com/show/16084/intel-tiger-lake-review-deep-dive-core-11th-gen/8 https://www.anandtech.com/show/16084/intel-tiger-lake-review...