The bowlers I mentioned did not play Cricket in the 50s. You don't need all the latest technology to tell that the Holding was very fast.
Game has changed since 70s, or at most mid 60s - but that doesn't mean Sobers is inferior to MoHa or Kanhai is is like Sabbir.
But, cricket changed from an English elite game to a professional men's game during that period, where technology started to get into the cricket. It's not surprising to know that, 1968 was the first time two mathematician at Uo Queensland first gave explanation of why cricket ball swings.
This footage is probably just after the change of No ball rule (front foot no ball, from back-foot), otherwise RR Lindwall was 5'11" at most & he was at fastest Watson's pace - that too Watto at his last years; no reason for his to over step by a foot. Personally, I don't believe before Lille & Roberts, world has ever seen 140KM speed. I heard lots of story about John Snow of 1970-71 - then watches his fastest spells at WACA & SCG (which was surprisingly the 2nd fastest wicket in AUS those days). Old footage of Hobbs' batting doesn't give me confidence that he ever faced anything faster than Afridi or Kumble's fast sliders - but, he is a true legend of the game, for his superiority in contemporary game - he'll make my all Test team over Gavaskar, Gooch or Boycott, for different reasons - just like I put Trumper between Greg & Ponting, among Aussies (Greg ahead

Only area that I feel probably was remotely comparable to modern days & cricket before 1960s is the quality of spin play - that too, because the game was slow & batsmen were expected to block spinners at around 1.5 RR, batting for hours with dead bat & pad play. The sort of foot-work that Lara, Azhar, Tendulkar, Zaheer, Viv had against spinners while making shots or the perfect defense that Gavaskar, Javed or Dravid had while killing spin - it's just not comparable; but you ask me, I'll say Hervey & Kanhai are among top 6 spin players ever.