Just keep in mind that the iPad can only hit a peak brightness of 600 nits. That's 400 nits below the lowest 1000 nit HDR10 standard. Plus the LED backlight cannot produce pure blacks like that of an OLED panel. So when you crank the brightness up to achieve 600 nits your blacks are now a dark grey. The new Galaxy Note 8 can hit a peak brightness of 1200 nits and produce pure blacks, exceeding the HDR10 standard. Here's to hoping the iPhone 8 indeed rocks an OLED.
Thank you for the IINA reference. I had never heard of it. So far it's the only player that correctly maps both the HDR10 ST.2084 Gamma and Rec.2020 Color Gamut video sources to non HDR displays such as my MacBook Pro.