Bern Caughey
Veteran
...your only bet is going to make sure you stick in the sgamut3.cine mode period. It will reduce any chance of crazy artifacts around light sources, highlights or other.
You can do some tests too in advance to make sure.
The F55 does really really well in these conditions, I'm assuming its the CFA but difficult to say...
http://www.dvinfo.net/article/acquisition/sonyxdcam/sony_sgamut_vs_sgamut3.html