This is probably the least sentimental movie version, and the one closest to the book. Edward Woodward's Christmas Present (with starving children Ignorance and Want under his robe) is seriously scary, as is Tiny Tim, who really looks on the brink of death. Susannah York, though wonderful, is a bit too controlled and upper-class for Mrs. Cratchit, however (and she can't summon up any tears for the "color hurts my eyes" scene.)
I was raised on the Reginald Owen version, and didn't realize until I saw it again recently how cheesy it is--the supposedly starving Cratchits look like they never missed a pork chop dinner in their lives (I don't think you ever actually see no-longer-tiny Tim on his father's shoulder.) And Scrooge's supposedly fragile sister is even worse.
For my money, the best Marley of all time is Alec Guinness in the otherwise cloying "Scrooge."
I ask in all honesty/What would life be?/Without a song and a dance, what are we?/So I say "Thank you for the music/For giving it to me."