I think you should shoot a technically more straightforward image to make any conclusions.
Loxia 21 is not very easy to focus correctly. Focus throw is quite short and there seems to be some field curvature (just personal experience, I do not know how the curvature actually is). With care and patience it produces excellent results in landscape type photography.
BTW I mostly shoot my Loxia 21 stopped down, to at least f/5.6 or f/8. This one was shot at f/18