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Lightroom for workflow and Snapseed for editing. I like the layout, UI design and especially the accuracy of gestures. I find I undo less with Snapseed than any other app. The colour rendition is really accurate as well.
I haven't dug into what colour profiling is used, but so far it's been surprisingly accurate between that and a calibrated monitor.@cake decent enough if you're just multi tasking. Reviews say the battery is a bit of a weak point, but I haven't experienced that to be honest. It does invite you to put the screen in full brightness though. It's that impressive.
Which app are you using for photo editing? Lightroom, or is there something better out there?