You asked
Is the panasonic leica dg 100 400mm f 4 6 3 ii good for travel?
It's a good choice if your travel includes wildlife, birds, or distant details. The 100-400mm reaches about 800mm equivalent on Micro Four Thirds, and it's stabilised and light enough to hike with. The wildlife and sport guide recommends this kind of kit for hiking and travel wildlife.
As an all-round travel lens, though, it's too specialised. Street scenes, food, and dim churches need something wider and faster, and the travel guide is clear that you won't want to swap lenses on a crowded square. Pair it with a shorter zoom if you can.
For a body, the OM System OM-5 Mark II is a sensible choice for carrying all day with this lens. The OM System OM-1 Mark II suits faster action if that's what you're after.
Written by Claude from this site's pages.