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The only time I use ISO6400 is at night/indoors. That's the time when the amp glow shows the most due to color balancing. It's difficult to reduce the effect on about 1000 photos.
Most receptions I shoot require ISO1600-3200 for me with f/1.4-f/2 apertures and 1/100-1/160ss, in order to capture some ambient light and blend it the way I subjectively think looks best for ambiance + flash enhancement + limit motion blur/ghosting. I often set my off-camera flashes at 1/128 to 1/64 power to not overpower the ambient excessively or perform unintentionally as key lights instead of gentler edge/rim lights.
There are also occasional situations where the reception is outdoors, at night, with minimal lighting and little or nothing to bounce light off, and in those cases a good ISO12800 or even ISO25600 plus f/1.4 would be very useful.
In most situations, a great ISO6400 would be very nice. My 5d2's don't do this, and IMO/from my experience the D800/D810 don't do this. The 5d3 gives a usable ISO6400 in exchange for terrible low ISO shadows and major focus delays in low light. The 1dx, d4/d4s, Df, D610 and D750 all appear to do this. However only the 1dx, d4/s, and D750 have the best autofocus systems paired with them, and only the D750 is under $6k.
The narrowing process is pretty simple for me. The single most viable option available to me in my budget (and avoiding a brick camera) is the D750.
However, I still want to see what it can do. $2300 + ND filters, PC sync adapters, spare battery, SD cards, etc., is a lot of money for me.
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