Hi Jer,
To begin with I quite like the photograph. It's a simple composition of an everyday subject which is usually not chosen as a subject. I think the photo is enhanced by being in black and white. I also like the bokeh and the sharp subject. The way you have done this...makes the door 'pop'.
I think there's a lot to be said for simplicity particularly in B&W, in this day of 'wow-bam'
computer generated photographs and photography.
Some of my favourite photographers are the 'old' guys...guys like Alfred Eisenstadt and Cartier-Bresson etc. A lot of their work was B+W. They also used a 35mm Leica with a 35mm or 50mm lens, much of the time. Their time of course was back in the 1930's to 1960's +.
I note that you have recently bought a Pentax 43mm F 1.9....a fast, top quality 'normal', in focal length lens. Coupled with your K-1 I think this makes a very useful daily, walk around combination. I wonder if Eisenstadt was still with us and active as a photographer...if this would be a combination he would like. I think it would be, although being a Leica man, I'm sure he would have something like an M-9 and a 35 or 50mm F 2.
When I was looking at your photo today, it put me in mind of these old masters. Their forte was simple compositions of everyday life, in B&W. Something I find myself doing more of, in recent years. I can't approach their skill and quality, but in my own way I can give it a shot.
I have the 28-105 with my K-1, a very good versatile lens....but I have thought about also getting a Pentax 31mm F 1.8 as a nice fast, daily, moderate wide angle. I may do this eventually.