Here is the list of the devices which are currently running on Android L (Lollipop).

Android Lollipop was released on October last year. The Google Nexus 6 was the first to get that update. However according to Google about 9% of android devices are running on Android L now. Android One devices were the second to get the Android L update and we haven't listed any android one devices.
Though the Android L was released last year still one a few devices are running on Android L. So here are the devices which are currently running on the latest Android L OS:

Motorola devices:
1.Moto X (2014)*
2.Moto G (2014)
3.Moto G (2013)*
4.Moto E (2015)
6.Nexus 6

Samsung devices:
1.Samsung Galaxy S6
2.Samsung Galaxy S6 Edge
3.Samsung Galaxy S5
4.Samsung Galaxy S5 Active
5.Samsung Galaxy S5 Duos
6.Samsung Galaxy S4
7.Samsung Galaxy S4 Active
8.Samsung Galaxy S4 Duos
9.Samsung Galaxy Alpha
10.Samsung Galaxy Note 4
11.Samsung Galazy Note Edge
12.Samsung Galaxy Note 3

HTC devices:
1.One M9
2.One M8
3.One M7

LG devices:
1.LG G4
2.LG G3
3.LG G2
4.LG G Flex 2
5.Nexus 5
6.Nexus 4

Sony devices:
1.Xperia Z3
2.Xperia Z3 Compact
3.Xperia Z3 Dual
4.Xperia Z2
5.Xperia Z1
6.Xperia Z1 Compact
7.Xperia Z Ultra

Asus:
Zenfone 2

Huwaei devices:
1.Huawei Ascand P7

OnePlus:
OnePlus one