Super zoom 14-140 excellent probably the best for its all round use sharp ,light small and compact the mk2 you could pair this with the pana Leica 100-400mm expensive but worth it then you have 28-800mm in just over kilo package
If you want out and out iq then the primes will give you this especially the Panasonic ones the pro zooms are probably better from Olympus in my view over Panasonic
But there are some value lenses that surprise the 20mm is well regarded for sharpness etc but focuses a little slower both 45mm budget lenses perform well then you have the so called exotic glass the Olympus 300mm prime,75mm prime and the nocticron specialised lenses
The 14-140mm does have its foibles though can be jittery in video if you only want lens the this would be first choice
If you want out and out iq then the primes will give you this especially the Panasonic ones the pro zooms are probably better from Olympus in my view over Panasonic
But there are some value lenses that surprise the 20mm is well regarded for sharpness etc but focuses a little slower both 45mm budget lenses perform well then you have the so called exotic glass the Olympus 300mm prime,75mm prime and the nocticron specialised lenses
The 14-140mm does have its foibles though can be jittery in video if you only want lens the this would be first choice