If you read the 1962 Mass you will notice that OT readings were integrated thoughout the Mass in addition to the Epistle and Gospel reading. I have never made a one-to-one comparison but I would imagine there is just as much scripture in the Tridentine Mass as there is in the NO.
And there you might be wrong. I have my handy-dandy 1962 St. Joseph Missal which was presented to me in when I was confirmed in March of 1963 right here. I can assure you that we hear far more scripture today than back then. There was no three year cycle in which all of Scripture is read. One heard the same scripture readings on the same day every year.
brotherhrolf,
I think there can be no doubt that the Ordinary Form offers a much greater variety of Scripture than the Extraordinary Form.
You mentioned the 3 year cycle in the OF. In addition to that is the addition of another reading (from the Old Testament) on Sundays. As thedavidwilson mentioned the Extraordinary Form does contain OT readings. The weekdays of Lent are an example of this. But, typically the readings in a Sunday Mass in the Extraordinary Form will contain a NT reading and a Gospel reading.
But, even in the Ordinary Form not all of Scripture is read.
According to Fr. Felix Just, S.J. in the Ordinary Form 3.7% of the OT and 40.8% of the NT is read over 3 years on Sundays and Holy Days. (This becomes 13.5% and 71.5% if you include weekday readings as well.)
In the Extraordinary Form of Mass 1% of the OT and 16.5% of the NT is read on Sundays and Holy Days each year.
None of these figures include the Psalms.
But, I do think that the typical Mass in the EF will actually contain more Scripture than the typical Mass in the OF.
In the OF on a typical Sunday we have an Old Testament Reading, a Responsorial Psalm, A New Testament Reading, and the Gospel.
In addition to that some parishes use the Entrance Antiphon and Communion Antiphon. But, in my experience, it is the rare parish that does not replace these 2 with hymns (which is permitted according to the GIRM).
In the EF we generally have the Introit (Entrance Antiphon), the Epistle, the Gradual, the Alleluia Verse (replaced by the Tract in the seasons of Septuagesima and Lent), the Gospel and the Communion Verse.
In addition to that Mass in the Extraordinary Form is preceded by the Prayers at the Foot of the Altar in which Psalm 42 is recited.
While incensing the altar a portion of Psalm 140 is recited. And while washing his hands the priest recites a portion of Psalm 25.
So, I think Mass in the EF will typically contain more scripture (largely coming from the Psalms) but a Mass in the OF will contain a much greater variety of scripture.
James