is there any real life measurement on these
The difference in battery consumption between WQHD and HD is slightly under 30 minutes at 100% battery. Meaning you will save roughly 30 minutes using HD instead of WQHD.
The difference in battery consumption between WQHD and FHD Is roughly 21 minutes at 100% battery. Meaning you will save 21 minutes if you use the FHD resolution instead of WQHD.
Anyone with Android's Power Saving mode can check what amount of battery consumption they can save by using different resolutions.
Simply open Android's Power Saving mode >> change screen resolution. At the bottom, the amount of time until the battery dies will change.