Samsung Galaxy S5 received Android 6.0.1 Marshmallow in South Korea a month ago, and now the updated firmware finally reaches Europe. Italy and Germany are apparently the first markets to get the update, but others should follow soon. Although there is no official information, this update should reach the US pretty soon as well.
Android 6.0.1 Marshmallow for Samsung Galaxy S5 comes with the usual changes and new features, including Google Now on Tap, Doze mode, granular app permissions, new emojis, multiple fixes, tweaks, and the latest security patches. In addition to these, the new firmware also comes with updates to the TouchWiz UI by Samsung. The build number is G900FXXU1CPD3, and the size of the update is 820 MB.
As usual, the updated firmware comes via OTA, but those who did not get the notification yet should go to Settings>About Devices>Software Update and hit the Update Now button.