I originally started to write a small photo comparison between the Nokia 9 and the Lumia 1020. Then I started to cover the phone a bit more and soon I noticed that I was out of space in this platform. So I quickly just made a random blog where I wrote in length about the Nokia 9 and the Lumia 1020. If you're interested about the images that the Nokia 9 can take, go check out the link. I also have other noteworthy stuff about the phone.
I asked
@madbilly what questions he and the forums have about the Nokia 9
and I think I answered some of them. If you have a question about
anything, feel free to ask and I will answer to the best of my
knowledge. I also took a lot of the compared pictures with the Nokia 8.1
and it performed really well, but I feel like the Lumia 1020 comparison
gives a better ballbark of where the Nokia 9 sits with it's camera(s).
Some of you might know that I was in Dubai for the Nokia 8.1 launch and I had some stories to write about that trip, but ultimately I was too lazy and procrastined too long. So here's a little something from me to the community; I bought a Nokia 9 so that you can make a better decision whether that phone is worth your money or not.
SPOILER ALERT if you like good photos and a great performing phone, this is a buy

Juho Lemmetyinen
Twitter: https://twitter.com/sizzlingshrimp
Instagram: https://www.instagram.com/sizzlingshrimp/
Other social medias: http://cs.uef.fi/~juhlem/contactpage.html
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In the 'Lumia Camera' App one can manually adjust White Balance, and compensate Exposure by + or - 3EV.
Were you still unable to produce a more accurate photo of the scene?
With regard to the camera shake you experienced why were you unable to set a faster shutter speed?
The OIS has permitted me to hand hold at 1/10 sec at 800 ASA.
I have a question for you @juho lemmetyinen Is it true that volume button works as a camera shutter button ? And if it does, have you used it ? And how does it feel ?
A similar comparison between Lumia 950 and Nokia 9 can be read on allaboutwindowsphone.com and confirms some very wrong presets in low light situations.
http://allaboutwindowsphone.com/features/item/23418_Initial_camera_comparison_Noki.php
http://allaboutwindowsphone.com/features/item/23425_Camera_data_set_2_Nokia_9_Pure.php