It's a good fit. Buttons and buttonholes? Not a problem. My challenge continues to be the finishing of collar and cuffs; this smooth cotton poplin was especially not forgiving when slip stitching the collar and cuffs over the seams, even though fabric has a slight stretch (I have had better luck with other fabrics, e.g., linen and knits). Bottom line: all done.
Now on to the next shirt. I want to keep making shirts until I can sew stand up collars with perfectly crisp and precise corners, with my eyes closed of course. That's my goal.