I also see the limitation of the chart since all the Oscilloscope have different characteristics just can not be compared by the chart.
I might need to add comments section.
Some Tektronix have superb Spectrum Analyzer.
Some has one ADC shared with all channel which reduces the sampling rate from 1G, 500M, 150M respectively with using 1ch, 2ch, 4ch at the same time while other has two ADC or have noe sampling rate drop for 4 channels.
No information about FFT feature in the chart and etc.