How do these images and Euclid itself compare to the James Webb Space Telescope?

What’s different about these images is their wide-angle view, as well as the fact that they are in the optical and near-infrared. JWST is specifically an infrared telescope. Any image you see from JWST is in a different band – a significantly longer wavelength – so you’re looking more through the dust and at cooler stars or gas. Euclid would show you the larger scale distribution of the stuff, and of course if the stars or gas is warmer.

And then, there’s the wide-angle versus very deep and fine-scale – take any image, and those two views give you widely different illustrations. It’s the same thing here. Euclid also has a second instrument that allows it to take low-resolution spectra of the sky, so it will be able to give us not just a wide-angle view, but a wide-angle, 3D view, measuring also the distance of objects on a large scale.