most DLH are 5 - Swiss I don't know but I'd guess 5..
The day of 5-abreast Avro 85s at LH opb Cityline are long gone. They were reconfigured from 80seats five-abreast to 93seats six-abreast a couple of years ago - terribly cramped. The LH opb Eurowings BAe 146 have always been 6 abreast.
Swiss are indeed 5 abreast - nice and comfy.