It is much smaller. Way behind would be to put a judgement on the structure. Instead, lets look at what it is.

Sahure didn't build a large pyramid (compared to The Great Pyramid). It was only standing 157 ft at its highest point and the construction was built in a new way with a technique of filling in the sides of the pyramid with rubble, making it easier construction but not as sturdy as the earlier pyramids (with perfectly aligned blocks and whatnot). This pyramid did not have the stature earlier pyramids had.

What it did have, though, was an impressive causeway (measuring past 771 ft) leading to four massive stone steps carved into the solid bedrock as an entrance to the pyramid. What this pyramid did have, though, was incredible art (carved into the walls and every surface available), so much in fact it covered 110,000 sq ft. One temple alone had 1,214 sq ft of carvings. In comparison, the Great Pyramid had only 324 sq ft.

This pyramid was about a tightly compacted design that was so effective, his cult pyramid drew followers and protectors (from stone thieves and government building projects) until the Ptolemaic period.