and another handheld one sigma 105 again at f 4,5 ISO800 time 1/320

the 400 has a better processor than the 350, so noise will be even better.
personally I can't see this noise as worse as the grain on a slides film of 400 and set to 800.
On the contrary if you remember this is only part of the whole capture.

There are no Borg. All resistance is fertile.