Above is one set of comparison photos of Lumia 920 and Lumia 928 posted by “TechnoBuffalo“. Good thing is not only in low light, but the reviewer has posted image comparisons between two devices in many different lighting conditions and apart from the case when “Xenon” is fired, there is hardly any noticeable difference. Both cameras share same camera module with F/2.0 aperture, OIS and same sensor size, so nothing surprising in results there. But, as you can see in the above picture, Xenon provides edge to Lumia 928 in capturing sharper images or freezing moving objects, which is not possible with a LED flash. Check some more sets below and click on the source link for more,
Shootout: Lumia 920 vs Lumia 928 in various lighting conditions.