The Ottoman sack of Constantinople was less destructive than the Crusader sack of 1204.

Evidence

After the capture of Constantinople, Mehmet had to keep his promise to his victorious troops to give them free rein for three days in the conquered city, but both Greek and Western writers attest that on the fourth day he took measures to safeguard manuscripts, buildings and relics. Some schol­ ars say that the Turkish conquest of Constantinople was less destructive than that of the Western Crusaders in 1204. — Bernard Lewis, From Babel to Dragomans, 635