It seems like you have a good opportunity now to resolve this issue since you'll be tiling over anything that doesn't look perfect. I know this sounds simplistic, but it looks like you just need to pour some extra concrete outside the existing edge to match the dimensions vis a vis the column per the other side. As long as it's not a structural issue, this shouldn't be too large a project. You'd only have to pour a small amount of concrete, so it's not too big of a job, but pouring concrete is never a small job either.
I'm a bit of a hack, so I'd talk to some concrete contractors regarding how long to let the new concrete cure prior to tiling, how to tie the new concrete area to the old concrete, whether you should include an expansion joint, etc.
I also don't know the impact of wet concrete interacting with EIFS, if any, if you do have that on the column and the house.