Once a certain level is past, I doubt we can see real differences so, if have already an almost-perfect refractor, do not expect miracles.
Said so, in my small experience each telescope has its "personality", with minor differences in tones/hues which may cause the observer to prefer it over equally good alternatives.
I use more often the DF because it is easier to handle, but personally prefer the views in the rather "unwieldy" DL: both can show exactly the same features, and rank them as very proficient to have a "mere" 100mm aperture but like more the DL's rendition of some features/structures, e.g. yellow/red stars.
How worth to you may be these subtle difference could be the question should try to answer to judge if "need" the Takahashi (of course there may be other reasons, but I tired to focus on the performance aspect, leaving out considerations about collectability etc...).
I have noticed that several people list the DL as still available: did Takahashi revised their plans and opted to keep crafting it? Were this the case would be indeed a good news!