Phileweb published their April camera/lens sales ranking by category for the Japanese market. The data was collected from the top 6 stores: K's, Yodo, Map Camera, Fujiya, Bic, and Kitamura:
Mirrorless camera
DSLR cameras
High-end compact cameras
Zoom lenses
- Tamron 28-200mm f/2.8-5.6 DiIII RXD
- Nikon Z 70-200mm f/2.8 VR S
- Nikon Z 24-200mm f4-6.3 VR
- Tamron 28-75mm f/2.8 DiIII RXD
- Canon RF 100-500mm f/4.5-7.1 L IS USM
Prime lenses
- Canon RF 50mm f/1.8 STM
- Sony 50mm f/1.2 GM
- Canon EF 50mm f/1.8 STM
- Sony 35mm f/1.4 GM
- Canon RF 35mm f/1.8 Macro IS STM
Source: Phileweb, via PentaxRumors