I absolutely despise the look of the 2004 sabres in the slo-mo cave fight for ESB. They are extremely dull and washed out, almost no colour in the blades at all. Compare this to the original, which is bright and colourful. The new version is truly dreadful once you see what it's actually supposed to look like.
(I was hoping adywan's theatrical ESB would correct this, but it seems he did not do so. Blast . . .)