hello, and welcome!
parking sensors - yes, it's not standard, need the parking assist for $500
back up guide lines - yes, i believe the new 14's include them. previously this was not part of the nav/infotainment software. (also, i think the lines are blue instead of yellow.) i would double check when you go on a test drive, but the other Lexus models have them now.
2011 CT200h Premium Starfire Pearl/black - July 2011
2013 Mercedes Benz GL550 Steel Grey/black - May 2013
Past: 2006 GS430, 2004 RX330, 2004 SC430, 01 GS430, 01 RX300, 98 GS400