Mark, is there anyway you can contact samsung about the dimming issues of movie mode and hdr+, and point out to them about the bottom and top leds being better controlled in standard mode? As u can see in the pictures standard is much better. I forgot to snag a picture of smart led on high for standard but it cranked up the bottom and top leds just like on movie mode, making dark scenes unwatchable to me (turning backlight down doesn't lower the brightness of the edge/corner leds, they're still activated shining up).
Standard with Smart LED low is the only acceptable combination that I can find.
Here's the Shallows 4k BD.
Movie mode dimming is all jacked up. Luckily standard mode swoops in to save the day! Not perfect, but better led control. IMO this is completely fixable by firmware. Standard could still use some FW tweaking to get those leds all the way off though.
In summary here's where the dimming seems messed up and incorrectly keeps top and bottom leds lit when they shouldnt when hdr is inputted and a little on sdr:
Movie mode: smart led low and horribly on high
Hdr+ mode: smart led low and horribly on high
Standard mode: smart led high is bad, smart led low is greatly improved.
1st picture is smart led high movie mode (default settings, possibly used in shootout, too bright)
2nd picture is smart led turned low movie mode
3rd picture is smart led low standard mode.