Hey all. I've taken some comparison shots between the N5 and a Nokia Lumia 925. I've gone for some low light shots here to show how the N5 holds up against one of the top low light performers on the market. Both sets of phots were taken using the stock camera app, all settings at auto with the flash turned off. The time of day was dusk. The chair shot had no artificial light source, the t-shirt was in a room with a desk lamp turned on and the garden was illuminated by a security light. I'm no camera expert, and these shots have been resized, so aren't a true reflection of either phones' output; but hopefully they give a reasonable, real-world reference for comparison in low light settings.
N5 on the left, L925 on the right.(Or 1st and 2nd respectively, depending on the screen you are reading this on)
Performance under good lighting, to my untrained eye, appears to be comparable, with the L925 being a little better at picking out detail in shaded areas. I'd say the biggest difference comes from the stock apps; The Nokia Camera app is quite frankly in an entirely different league to stock Android 4.4. The features, coupled with granular control over the hardware, are excellent, as is the UI. The Android equivalent; not so much. Still, the overall package is a nice kick-on from the N4 and I reckon it'll serve for most people.
Edit:
I've taken a few close ups of my boys snoozing after our walk this morning, to show what the N5 cam can do in a macro sense. They were taken from around 5/6cm from the subject, indoors, this time using the HDR+ mode. Again, they have been resized, so aren't genuinely accurate, just an indication.