Based on THQ Nordic Tweets:
Series X: Native 4K 60 FPS
Series S: 1440P @ 30 FPS Dynamic Resolution
PS5: Native 1080P upscaled to 4K
Based on THQ Nordic Tweets:
Series X: Native 4K 60 FPS
Series S: 1440P @ 30 FPS Dynamic Resolution
PS5: Native 1080P upscaled to 4K