Nigel Clough believes Tuesday's stalemate with second placed Brentford demonstrates the progress the Blades have made in recent months.
Speaking after the entertaining draw, in which both teams had chances to win the game, Clough remarked: "It was a cracking game, it was one of the best goalless draws I have seen for a long time. It is the best League One game we have been involved in since we arrived.
"It took us 15 minutes to get to grips with Brentford who started the game exceptionally well, but we held on in there and arguably after then we had the better, if not, the most chances.
"For a nil-nil it was such a brilliant game and the effort and desire our players showed, once again, was outstanding."
The Gaffer continued: "Brentford showed why they are pushing for automatic promotion, but we were always in the game and in the second-half I honestly thought we would nick it.
"When Ryan Flynn cut inside and curled his effort towards goal, we all thought it would land in the bottom corner of the net and but for a deflection it would have done.
"We are delighted with a point against an excellent side and another clean sheet is also immensely pleasing.
"We would have lost this game a few months ago, but now we are capable of digging in, staying resolute and grinding out results, even against the better teams in League One."