"Leo and Barry, would you agree with the expressions given by the ARG critic?"
Too much meaningless subjective blather for me. The biggest difference of all is simply that there's been a 40 year duration for technical upgrades to have happened. It's sounds bigger because the dynamic range of the recording is bigger. That, and the fact that the Concertgebouw is a somewhat different orchestra now than they were then. They still have excellent woodwinds, just as they did back then. But the brass and percussion are a tad "bigger" sounding now these days. They're more "modernized", in a sense. In both recordings, the tempi are a bit faster than average, I suppose. It's certainly quicker than his slightly droopy Berlin remake. To my mind, Elly Ameling is an even better soprano for the part than Christine Schaefer proves to be. Still, she's quite good when compared to most. It should also be remembered that Haitink made another good M4 recording with the Concertgebouw in the early 1980s, with Roberta Alexander.
On the whole, I feel that the Macal/Czech Phil. M4 is a slightly better contribution to the M4 discography. Generally speaking, the tempi are nearly as quick, and the Czech Phil. is every bit as idiomatic for Mahler as the Concertgebouw is; especially for these lighter symphonies. The biggest difference is that Macal's soprano (Kaune? - something like that) is really, REALLY good. Then again, the Concertgebouw has those fabulous sounding sleigh bells. But in the case of Haitink's latest M4 recording, be prepared to turn the volume up - it's a slightly low level recording. Once the volume is turned up, everything snaps right into focus.