diff --git a/changelog/5026.feature.rst b/changelog/5026.feature.rst
new file mode 100644
index 000000000..aa0f3cbb3
--- /dev/null
+++ b/changelog/5026.feature.rst
@@ -0,0 +1 @@
+Assertion failure messages for sequences and dicts contain the number of different items now.
diff --git a/src/_pytest/assertion/util.py b/src/_pytest/assertion/util.py
index a62297075..b53646859 100644
--- a/src/_pytest/assertion/util.py
+++ b/src/_pytest/assertion/util.py
@@ -297,7 +297,7 @@ def _compare_eq_sequence(left, right, verbose=0):
         if len_diff > 0:
             dir_with_more = "Left"
             extra = saferepr(left[len_right])
-        elif len_diff < 0:
+        else:
             len_diff = 0 - len_diff
             dir_with_more = "Right"
             extra = saferepr(right[len_left])