If the images are sharp, it is OK but the way to test this is with the lens wide open (f2.8 in this case) Test with an outside setting in good lighting so that you can use high shutter speed to avoid shake without a tripod.
As others noted, I don't think the SL 1 has user accessible focus calibration. But to test the setup, aim at an object with high contrast (something like a yardstick works well) stuck into a lawn and choose a single focus point and put it on the yardstick. Take several shots and closely examine the results on the computer monitor and if the auto focus adjustment is correct the yardstick and the grass just in front of and behind will be in sharpest focus with the focus becoming less sharp the further you look from the focus point. If the point of best focus is in front of or behind the yard stick, then focus calibration is off.
Usually, the issue of focus calibration is most critical with long and fast telephoto lens because the depth of field is so shallow. With shorter focal length glass, unless you are on top of the subject the depth of field is deeper and a minor deviation from perfect may not be of concern. All of my long white primes were dead on with all of my 1DX bodies
Prior to moving to 1DX series bodies, I was using a 1D Mark II which did not have the ability for the user to adjust focus calibration. With that body, I never found an issue with any of the glass I was using so it isn't like every lens or body needs adjustment and most people didn't even think about this issue until the ability to user adjust focus calibration begin to appear.
Rodger
EOS 1DX M3, 1DX M2, 1DX, 5DS R, M6 Mark II, 1D M2, EOS 650 (film), many lenses, XF400 video
