I was brought up on the OT.
Nothing can touch them in my mind.
But is that just nostalgia? I'll never know.
I'm not a massive sci-fi fan, I love movies in general - I love everything from Hitchcock to Leone to Scorsese to Tarantino.
Very few of the films in my 500+ DVD collection is sci-fi.
But I love SW.
Is ROTS going to eclipse the OT?
It never could in my mind.
But looking at it totally impartially and putting my nostalgic affections aside....
ROTS seems to be quite an acheivement.
GL has done something quite bold with the PT.
It is quite unique for a director to devote three films to an original story which everyone knows the outcome of.
Everyone who has seen the OT knew where this was leading from day one.
He has managed to keep the PT interesting and exciting, while simultaneously making it feel comfortingly familiar.
ROTS is in many ways more complex than any of the OT films.
It pulls together two films-worth of exposition in style. Looking at TPM and AOTC as separate entities is a little pointless, the PT is far more of a complete saga than the OT.
Like I said, I personally will never compare the PT with the OT, but ROTS has got everything. On paper it is just as impressive as anything in the OT.
I guess the only way to judge will be to find someone who has never even heard of SW, and show them all six films in order. That'll be the only opinion that matters in the context of this question. But it doesn't really matter much to me - I can't unlearn what I have learned....