Sofuoğlu then signed with Ten Kate Honda for three more years. For 2008 he rode a 3rd Ten Kate Honda CBR1000RR in World Superbikes, as part of a junior team. He was not successful, and returned to Supersport with the team for 2009. This time the team struggled to match Cal Crutchlow's Yamaha and the Parkalgar Honda of Eugene Laverty, leaving Sofuoğlu to fight for third in the standings. He opened 2010 with a succession of podium finishes, leaving him in a 3-way championship battle with Laverty and Motocard Kawasaki's Joan Lascorz. He eventually claimed the title, finishing on the podium in every race. For 2013, as the world champion, Sofuoğlu had the option of riding for the Italian Pedercini Team but he opted to join the Indian Mahi Team owned by Mahendra Singh Dhoni. Towards the end of the 2010 season Sofuoğlu appeared in Moto2 at the Portuguese Grand Prix, with the Technomag-CIP team, replacing Shoya Tomizawa, who had died in an incident at Misano. Sofuoğlu was fourth fastest in practice, which put him on the front row after qualifying was rained out. The race marked his first ever dry laps on the bike, but he led for the majority of the race before finishing the race in fifth despite having to try to adjust the handlebars of the bike while racing. Sofuoğlu remained with the team in 2011, riding one of the team's Suters. His best finish was 2nd place at Assen. During training for the 2017 Supersport World Championship in early February, Sofuoğlu broke a finger bone. He had to undergo two operations. Just before the first round of the championship in Australia, he performed a two-day test, but was not ready to race because of pain when braking, and decided not to start. He flew back home to undergo another operation, and stated that he would miss the opening two rounds, but would be present again in Spain, the third round of the championship. On September 30, Sofuoğlu broke his pelvis in three places after a crash during the Superpole session of a championship race in France. The same day, he was flown to Istanbul, Turkey for medical care by air ambulance. His doctor stated that Sofuğlu can be discharged from the hospital in 5–6 weeks if everything goes right. Sofuoğlu confirmed the recovery period as 12 weeks.