iphone gpu start from A11 is double FP16 performance (FP32:FP16 = 1:2) and simultaneously double texture fillrate. if we compare with same core (256 FP32 core) tegra x1 only has 16 tmu vs 32 tmu on A12, A13 and A14. a13 GPU fp32 GFLOPs around 660GFLOPs. after compare A10 and A13 score on 3dmark wild life, i think 3dmark wild life shader code utilize 90% FP16 code and 10% FP16 code so speed up around 1.8x vs desktop 100% FP32 shader code.

PCWorld comment is really nonsensical. Wild Life is the first "real" cross platform benchmark — doing exactly the same work across different platforms and APIs. It should be treated as any there synthetic benchmark, keeping in mind it's intended use case and limitations. Real games obviously might perform better — because they are doing many other things at the same time and because their utilization of the GPU is different. On the other hand, if you just want to compare raw GPU performance for a common run-on-the-mill deferred shading scenario, Wild Life is exactly what you need.

But PCWorld's  conclusion that "you should not compare an iPhone GPU to a laptop GPU because there is no way that an iPhone is faster" is void of any logic.