I've never seen the 1934 version, so I have nothing to compare with, but John Gielgud was sufficiently overbearing, cold, and creepy in the 1957 The Barretts of Wimpole Street for me to not even want to rent the original. There's an undercurrent of incest when he exerts control over his daughter, so it was probably a risk for him to take the role.
It was not a risk, however, for Jennifer Jones to take on Elizabeth Barrett. She's the queen of melodrama (the predecessor of Susan Hayward) and often has characters who get sick or die in her films. In this one, Jonesie is an invalid and meekly submits to all her father's wishes - until one day she meets the energetic, magnetic Robert Browning (played by Bill Travers). They write each other beautiful letters and fall in love, but she fears they can never overtake her father. It's a classic melodrama and shows off her great training as a heavy dramatic actress.
Young Virginia McKenna nearly steals the show as Jonesie's younger, fiery sister who occasionally has the guts to stand up to their father. They're both clad in beautiful period gowns, and Virginia has a fresh-faced sweetness mixed spunk that reminded me of Katharine Hepburn in Alice Adams. Plus it's really cute to see her act with her husband when they're not paired up as love interests. There aren't any Born Free sparks between them; it's called acting, and Virginia lets Bill romance her onscreen sister.