Doubtful. Sensor spots would show up when you stop down the aperture. Normally, unless the sensor is pretty filthy they won't show up at wider apertures UNLESS you crank up the contrast in post. At least that's been my experience.
Hey, I use both my X-T1 with the 18-55, 35, Zeiss 12 and the 55-200 for landscapes, cityscapes, etc. I love it. I've printed up to 24 x 18" (so far) and the results are phenomenal and I AM A PIXEL PEEPER. LOL
I also shoot with the Nikon D800, but "most" of the time I use the X-T1 -- even for stock images. I then process them in LR 5.0, though I've used both Iridient Developer, and Silkypix. But LR 5.x has really improved the process.