I love winter light in canyons... slow to change and one slope stays shaded, affording many opportunities for dramatic light.
Phase One IQ4 + Schneider Kreuznach LS 150mm f/2.8 Examples: Various
I have more to add, but this image shows off what the IQ4 can do.
Includes images up to full 150MP camera resolution (14204 X 10652).
Cottonwood Tree Glowing in Winter Shade
f11 @ 1/40 sec electronic shutter, ISO 50; 2019-12-07 11:49:03[low-res image for bot]
Phase One IQ4 + Schneider Kreuznach LS 150mm f/2.8 IF
ENV: Silver Canyon, altitude 4500 ft / 1372 m, 55°F / 12°C
RAW: LACA corrected