A recent leak suggests the Vivo X500 series may arrive in 6.4-inch and 6.9-inch display variants, with the larger model likely positioned as the Pro Max. The top-end version is reportedly being tested with a 50-megapixel LOFIC primary sensor designed to improve dynamic range. It could also feature a 200-megapixel periscope telephoto camera for enhanced zoom. Vivo is a…