I think this depends a bit on the area. I work in the field of metabolic engineering (i.e. engineering microbes to make new products). When I worked at a biotech company in the Bay Area, I had a pretty decent salary, while still a bit lower than software engineers. Right now, I live in the Netherlands and my guess is that the discrepancy is a big larger here.
Hey I am in my masters of bioinformatics in the Netherlands and was wondering what kinds of salaries you are seeing for metabolic engineering and related fields. In my uni things like salaries rarely get discussed but I think it's quite important.