Hubble is able to take higher resolution (smaller angular resolution) pictures in it's optimum wavelengths. Even though JWST has a larger light bucket, the phot

Hubble is able to take higher resolution (smaller angular resolution) pictures in it's optimum wavelengths. Even though JWST has a larger light bucket, the photons its capturing are longer wavelength so the end result is a lower resolution. You asked in another comment "Are the finest details in this picture finer than the finest details in the Hubble ultra-deep field?". In a sense, yes since the finest details in this photo are of a wavelength that Hubble isn't sensitive too, so they are visible here but do not show up in an equivalent Hubble shot.