In RAW format preferences (RAW Format Preferences, inside the exploration windows in Format Explorer, pressing Edit Preferences button in the corresponding DSLR_RAW node) it is possible to choose between four interpolations options for de-Bayer an image. Here are shown examples of each one utilizing the same area of an image zoomed in 3:1 and with identical STF applied.
Default option and most recommendated is VNG (Threshold-Based Variable Number of Gradients)