I use an HTC M8 and in the list view I can see if the last msg. in each thread was sent by me or someone else. It is a very handy feature. Here is a screenshot to show you what I mean:

https://lh6.googleusercontent.com/-46tYwCcrPLo/VU1hItGvCLI/AAAAAAAATAo/51CU9H9a2_A/s1533-Ut/Screenshot_2015-05-08-21-14-12.png