I am going to be in Tokyo for two weeks next month. I have almost as much fun putting together a kit for a trip, as I do actually going. Yeah . . . bit of a photo nut.
There are three camera choices before me, IQ is excellent in all three:
1) Leica M9/21-35-50-90. Pros: compact; cons: no IBIS, battery life marginal.
2) Nikon D3/21-50-105. Pros: great battery life; cons: heavy, no IBIS
3) Pentax K1/24-70(zoom), 50 (or 31/40/77). Pros: IBIS, better high ISO; cons: no ultrawide.
The Nikon is the old warhorse. Utterly dependable. I have a full selection of lenses -- no compromises on lens choice. It is heavy, but the battery will go for days. File sizes and resolution are moderate, by today's standards.
I will give you a complete different thought, from my own experience. And maybe you will hate me for that....
😉.
I recommed the Nikon D3 (I have a D3s so I know this beast very well
🙂).
You say the main disadvantage is the weight.
But in general when photographers today talking about camera weight they are often missing the essential point:
When you are walking around with your camera you are carrying
- your own body with its weight
- the camera and lens(es).
Body weight + camera equipment is the whole weight you have to "schlepp around". The Equipment is only a tiny percentage of this whole package. And the difference in weight between the Nikon and the Leica or Pentax for example is tiny in comparison to the whole weight you carry around. That are only some 100 grams.
The by far best way to carry less weight: Just loose some body weight. It is easy to loose 1-2 kilograms of fat.
I've experienced that by myself the hard way: Because of a hard time in my job and lots of stress and not enough time to do sports I've gotten 10 additional kilograms of body weight over some months.
That is the same as if I would carry a photo bag with 10 kilogramms of gear. With every single step I made! Very uncomfortable, and I got much sooner breathless because of the additional body weight.
It is the same result as always carrying a 10 kg Rucksack or 10 kg photobag.
After I reasiled that I started to change some things in my life and reduced my body weight.
And since then I have a complete different view on the "camera weight" topic. The differences in camera weights are negligible in comparison to the whole package (including body weight).
And most of us in the industrialised countries have too much body weight. So loosing 1-2 kg would be good in every case (improvind our health and general feeling) and that is much more of a difference as the difference between camera bodies or lenses.