Honestly Steven, 99% of all the talk you see online about "low light noise" is just people needing to whinge about something. Most cameras today are doing great.
Do yourself a favour and find the worst example of noise in a RAW file from your current Fuji, then download a trial copy of DxO PhotoLab and crank up their denoise tool.
Would be interested if you have a file that really is too awful to be useful? DxO is amazing, and cheaper than a new camera!