A fisheye lens is a fisheye lens. It is constructed that way. The opposite of that is a rectilinear lens and that is also constructed to be rectilinear.
The Nikkor 14-24mm F/2.8 is one of my all-time favorite lenses because it one of the widest rectilinear lenses with a constant aperture available. It was for a long time but there are other options now. On my site, you can easily search for such a lens. Here is a link to all Canon EF-compatible full-frame rectilinear zoom lenses that go wider than 15mm. This is a live link, so more results will appear as new ones get announced.
The Canon offering is the EF 11-24mm F/4L. It is extremely wide and probably high quality but I have not tested it yet. The Sigma Art 12-24mm F/4 DG HSM is an excellent performer for roughly half the price of the Canon! It is very sharp and shows little distortion, although a fair amount of vignetting. The Tamron SP 15-30mm F/2.8 is one of their better lenses, although far from being as wide as the Canon and Sigma offerings.
At this point in time, APS-C cameras are at a disadvantage. There is no comparable rectilinear lens to the ones mentioned above. To get only a 15mm equivalent you need to have something that is wider than 10mm on an APS-C camera, even more so with Canon's 1.6X crop. Still here is a similar search for Canon EF-mount APS-C rectilinear zoom lenses that are at least 10mm wide.
When you see Elia Locardi's images (I am also familiar with his work), the wide-angle is one thing that gives them the striking perspective. There is also a huge amount of processing but that has nothing to do with the lens. To get a similar perspective on an APS-C camera, the only choice is the Sigma 8-16mm F/4.5-5.6 DC HSM. Its quality is fairly good with excellent sharpness but it has strong barrel distortion (which is not the same as fisheye projection) and really heavy vignetting. It is a lens that I often considered but ended up deciding it is better to change sensor formats (Even all 7-14mm lenses for Micro Four-Thirds are much better performers). People do correct some distortion in software but beware that it always reduces image-quality and it will affect your framing, significantly so if there is a high amount of barrel distortion.