Index: Lib/lib2to3/tests/test_fixers.py
===================================================================
--- Lib/lib2to3/tests/test_fixers.py	(revision 75274)
+++ Lib/lib2to3/tests/test_fixers.py	(working copy)
@@ -3238,6 +3238,46 @@
             """
         self.check(b, a)
 
+        b = r"""
+            try:
+                m = list(s)
+                m.sort()
+            except: pass
+            """
+
+        a = r"""
+            try:
+                m = sorted(s)
+            except: pass
+            """
+        self.check(b, a)
+
+        b = r"""
+            try:
+                m = list(s)
+                # foo
+                m.sort()
+            except: pass
+            """
+
+        a = r"""
+            try:
+                m = sorted(s)
+                # foo
+            except: pass
+            """
+        self.check(b, a)
+
+        b = r"""
+            m = list(s)
+            # more comments
+            m.sort()"""
+
+        a = r"""
+            m = sorted(s)
+            # more comments"""
+        self.check(b, a)
+
     def test_sort_simple_expr(self):
         b = """
             v = t
Index: Lib/lib2to3/fixes/fix_idioms.py
===================================================================
--- Lib/lib2to3/fixes/fix_idioms.py	(revision 75274)
+++ Lib/lib2to3/fixes/fix_idioms.py	(working copy)
@@ -130,5 +130,24 @@
         else:
             raise RuntimeError("should not have reached here")
         sort_stmt.remove()
-        if next_stmt:
-            next_stmt[0].prefix = sort_stmt.prefix
+
+        btwn = sort_stmt.prefix
+        # keep any prefix lines between the sort_stmt and the list_call
+        # and shove them right after the sorted() call.
+        if "\n" in btwn:
+            if next_stmt:
+                # new prefix should be everything from the sort_stmt's prefix 
+                # up to the last newline, then the old prefix after a new line
+                prefix_lines = (btwn.rpartition("\n")[0], next_stmt[0].prefix)
+                next_stmt[0].prefix = "\n".join(prefix_lines)
+            else:
+                assert list_call.parent
+                assert list_call.next_sibling is None
+                # put a BlankLine after list_call and set its prefix
+                from ..fixer_util import BlankLine
+                end_line = BlankLine()
+                list_call.parent.append_child(end_line)
+                assert list_call.next_sibling is end_line
+                # new prefix should be everything up to the first new line
+                # of sort_stmt's prefix
+                end_line.prefix = btwn.rpartition("\n")[0]