Xiaomi on Thursday unveiled the 17 Ultra, its latest premium smartphone model that features improved night photography and mobile imaging capabilities on the back of the firm’s enhanced partnership with German camera maker Leica. “We work together to build future-proof optical technology … and completely reshape the mobile photography experience,” Xiaomi president Lu Weibing said at the handset’s launch. In a side-by-side comparison of dimly lit photos taken in Hong Kong with Xiaomi’s 17 Ultra...