In Colin Gunton's The Doctrine of Creation (T&T Clark, 1997), he says:
In view of what we have just noted [in the previous section on Thomas Aquinas, Duns Scotus and William of Ockham] about the non-trinitarian treatment of creation in the Middle Ages, Luther's claim that he was the only person to have understood the first chapter of Genesis is only slightly exaggerated. The change he brings about is remarkable. (p71)
A footnote further on in the text says: "Luther is contemptuous of Augustine's mystical interpretation of the text, as well as of his and Hilary's view that God created instantaneously." There is a citation to Luther's Lectures on Genesis.
I am curious about the following:
What did Luther himself think was the major contribution of his interpretation? Was it the trinitarianism, the literal/material reading, the non-instantaneous creation, or something else?
Did he actually say that nobody else had ever understood Genesis 1 properly? (Perhaps this is an example of Lutheran hyperbole.) Did he specifically engage with the full range of patristic writings on the creation?