Thanks for your thoughts.
Right now I have these lenses:
Panasonic 12-32
Panasonic 20 f/1.7 (original)
Olympus 45 f/1.8
Olympus 40-150 f4-5.6 (original m.Zuiko)
Panasonic 100-400
I am thinking of getting the Olympus 12-40 because of its quality and pair it with the Panasonic 35-100 (good used copy available). The instinct for the 12-100 is the synchronized stabilization and the one lens for most uses, albeit at a weight cost. The total dollar amount for either strategy is about the same. I need to make a decision about the 35-100 right away, though. I really am looking for good color rendition, sharpness, and as good a bokeh as one can get.
I have gone "Olympus" with the OM-D E-M1 Mark II and E-M10 Mark III combination.