@mjYou can notice the difference by placing them in Photoshop as two different layers and then show/hide one of them.
I can't test Photoshop 2024's generative fill for this photo now because I only have Photoshop CS6. But I had trialed Photoshop 2024's generative fill before and I did not notice any blur.
Images can be downloaded from Adobe Firefly web app in the following formats: JPEG and PNG from the Text Effects and Text to Image features and SVG from the Generative Recolor feature and can have a maximum resolution of 2k x 2k.
If your original is larger than 2k x 2k, then it's probably going to look blurry.