Timescale wise, the Lightning and Su-15 are not comparable. The Lightning entered regular service around the same time as the Su-9, the Su-15’s predecessor – around 1959. The Su-15 a generation ahead from the Su-9 (and the EE Lightning).
Concerning the Lightning’s performance, from Wikipedia (but well sourced):
^ An F.6 equipped with Red Top missiles can reach Mach 2.0 on an ICAO Std. day at 36,000 ft. A clean F.6 can reach Mach 2.1 at 37,000 ft .[5]
^ This is based on a maximum-range subsonic intercept radius of 370 NM (425 mi, 625 km). An F.6 equipped with Red Top missiles can climb to 36,000 ft and cruise at Mach 0.87 to a loiter or intercept area 370 NM distant. It then has 15 minutes on station to complete the intercept or identification task before returning to base. The afterburners are not used during this profile, and the total mission time is 112 min.[5]
^ An F.6 equipped with Red Top missiles can climb to 36,000 ft, accelerate to Mach 1.8, and intercept a target at 135 NM only 10.7 min after brake release. A 2g level turn allows a rear-quarter re-attack 1.6 min later. Following a best-range cruise and descent, the Lightning enters the landing pattern with 800 lb of fuel remaining with a total mission time of 35 min.[5]
^ This is the initial climb rate associated with the Lightning’s best time-to-climb profile of 450 KIAS to Mach 0.87. Using this profile, a Lightning F.6 with Red Top missiles can climb from Sea Level to 36,000 ft in 2.1 min following initial acceleration to 450 KIAS, or 2.8 min from brake release. A clean F.6 can perform the same climb in 2.0 min following initial acceleration, or 2.7 min from brake release.[5
http://en.wikipedia.org/wiki/English_Electric_Lightning#Operational_history
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