[coldtea]

Depends on what one asks from them. They might don't do as well on low light as a Sony high-end mirrorless, but they far exceed what their analogue medium format ancestors did (ISO/noise wise), which is more than enough.

I find this modern preoccupation with crazy ISOs (which one would never use in the film era) a red herring. Especially for landscape work, it's a non issue. What you want there is excellent dynamic range, which those offers.

And there are some such as these that are quite the monster: Pentax 645Z.