BlackBerry was holding back on the Z30 Display
Go download the Kindle app right now and then change the brightness in the app to the highest brightness possible. This works on 10.3.0.700 not sure if it does on the other OS's. Compare the brightness through the native controls and the app by looking at the hub normally and then when adjusting the brightness in the app, peek into the hub to keep the settings. It's SUCH a big change, BlackBerry is holding back honestly because this thing gets as bright as the Z10 it's ridiculous.
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