A patient presents with a platelet count of 700 x 109/L with abnormalities in size, shape and granularity of platelets. WBC count of 12 x 109 /L, hemoglobin of 11g/dl and the absence of the Philadelphia chromosome. The most likely diagnosis would be-
Polycythemia vera
Essential thrombocythemia
Chronic myeloid leukemia
Leukemoid reaction