The uppercase 'Q' tail crosses the circle.

The centre vertex of the uppercase 'M' is on the baseline.

The top storey of the '3' is a smooth curve.

The uppercase 'G' has a spur/tail.

The 'l' (lowercase 'L') has no serifs or tail.

The top of the lowercase 'q' has a vertical or slightly angled spur (pointed or flat).

The '1' (digit one) has no base.

The stem of the '7' is curved inwards.

The uppercase letter 'O' is circular or equal proportions.

The bowl of the lowercase 'g' is a circle or ellipse or ellipse.

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Note that the fonts in the icons shown above represent general examples, not necessarily the two fonts chosen for comparison.
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The uppercase 'Q' tail is below and separated from the circle.

The centre vertex of the uppercase 'M' is above the baseline.

The top storey of the '3' is a sharp angle.

The uppercase 'G' has no spur/tail.

The 'l' (lowercase 'L') has a rightfacing lower serif or tail.

The top of the lowercase 'q' has no spur or serif.

The '1' (digit one) has doublesided base or serifs.

The stem of the '7' is straight.

The uppercase letter 'O' is taller than it is wide.

The bowl of the lowercase 'g' is a flattened circle or ellipse or ellipse.
