I did some research how camera lenses works and found out why some pics versus other phones may look blurry.
First of all Lumia 920 have large field of view (26mm focal length). That makes side of images look bit stretched and objects far away appear smaller, making them have less detail visible. Plus side of this is that you can get more stuff in to your photo.
Aperture size is f2.0 and that makes your focus plane and area smaller than smaller aperture cameras (larger f number). What i understood that it should make that particular focus area sharper and it also gives greater bokeh effect. You should be able take great macro shot and close ups with nice depth of field, but when taking larger i.e. landscape shots, those probably appear softer. Other thing is greatly increased low light capability and there Lumia 920 deliveres.
If you compare those values to iPhone 5 (33mm focal lenght, f2.4 aperture) you can find part of reason from there why some shots look softer. iPhone 5 have deeper depth of field which makes larger part of image to be in focus. Other part is software which can be improved.
Aspect ratio have own impact to photo also. You should always compare 16:9 image to 16:9 image or 4:3 to 4:3 image, or at least make sure compared part of image appears same size in photo if comparing different aspect ratio photos.
All above values are in conjunction to each other and determines how your photo turns out. Like The Verge said Lumia 920 is more to people who know about photography.
A great camera for pros, but what about the rest of us?
Bottom line is that you need to shoot differently with Lumia 920 compared to other phones and you get great photos. And choose your aspect ratio of photo to suit what you are shooting. I think when software is fully finalized Lumia 920 can really rock.