The number of samples looks awfully high at 1024. I'd start lower - say, 60 - and work your way up if it looks like crap. Also take your IDL bounces down from 7 to 2 or 3 - again, work up from there if needed.

Here's a screenshot of my starting point.

I wouldn't worry about tone mapping until you've figured out what it does. This image from my gallery absolutely required it so as not to come out virtually pitch black.

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Windows 10 x64 Pro - Intel Xeon E5450 @ 3.00GHz (x2)

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