Radeon Pro Vega 48 graphics card in new iMac

I work primarily with still photographs in Photoshop. I'm about to buy a new iMac. Is there an advantage to me in getting the iMac with the Radeon Pro Vega 48 graphics card rather than staying with the default Radeon Pro 580X? From what I see online, the Radeon Pro Vega 48 seems useful for video and gaming but I haven't seen any mention of an advantage for still photography.