Shot in Stockholm during the midnight running event (Midnattsloppet) I tried the most challenging test for noise reduction I could imagine.
There were different light sources of different refresh rates, shot on different ISO:s and different resolutions with different fps at a minimum of 2.8 aperture.
Post production was done in Premiere (editing) and noise reduction in After Effects and then exporting to DPX 4K and grade in DaVinci Resolve with film convert plugin (without grain). Finished editing in Avid to 1080p masters (lower resolution due to some 2K material).
My conclusion is that at 2K, noise reduction will begin to show some artifacts, but at 4K, 5K and 6K it won't be a problem. So instead of decreasing shutter (which gives you a more video-ish look), increasing the ISO, even to levels where it's unusable will still be able to work in a cut with some advanced noise reduction.
Red Epic MX
Red mini mags 512 GB
Canon 24-70 2.8L
To see some before and after, check it out here: youtu.be/USUBF2mTCTM