I have detailed an issue in a video overview with regards to aircraft shadowing. I thought it was across the board where aircraft appear over exposed and the dark side of an aircraft was still too light looking and the shadows didn't look natural. I then saw a video clip on YouTube which looked a lot different from what I was seeing in game and the shadows in the clip looked much more realistic.
After some investigation and assistance from other forum users, it seems this issue is hardware specific - more notably the iPod Touch 5G and the iPad mini 1st gen look natural but faster devices look washed out such as the iPad Air 2, iPad mini 2, iPhone 5s and the iPhone 6. The iPod and the mini 1G share the same A5 processor and associated graphics so I'm assuming it is related to that and a different way of rendering or light occlusion on the slower hardware.
Examples below. FYI - these examples were taken at the exact same time of day and location i.e. UTC 2am on SFO Runway 10R which can be verified by the shadow angle and position.
The Air 2 has the lighter looks/shadows, the Touch 5G the darker, more natural looking lighting.