Quiet High End Frost Free Fridge Freezers

Hi
I am looking to purchase a high end frost free fridge freezer. The models I am looking at are the following:

Siemens KG32U123GB
Bosch KGU 32165 and KGU 35125
Liebherr CN 3666
Miele KFN8862

1) If anyone has experience with these particualr models can you tell me if they are quiet. I read the previous post regarding quiet frost free fridge freezers, but I don’t wish to assume that just because one model from one particular manufacturer is quiet that the rest of their range is too. Thus I would be grateful for peoples opinions on the above particular models and I of course understand that this is subjective and is dependent on the surroundings, but still I am asking for an indication from people with direct experience of these particualr models;

2) A couple of the models I have listed – the Liebherr CN 3666 and the Miele KFN 8862 do not seem to have anti bacterial protection – how important is this when purchasing?

Thank you for assisting me.
Kind regards